v3.24.0.1
Fair Value Measurements - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2021
Dec. 31, 2020
Assets:        
Bonds available for sale [1] $ 231,733,000,000 $ 226,156,000,000    
Other bond securities, at fair value (See Note 5) [1] 5,241,000,000 4,485,000,000    
Equity securities [1] 728,000,000 575,000,000    
Derivative assets 6,595,000,000 6,049,000,000    
Counterparty netting (3,864,000,000) (3,895,000,000)    
Cash Collateral $ (2,220,000,000) $ (1,640,000,000)    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets    
Total derivative assets $ 511,000,000 $ 514,000,000    
Short-term investments [1] 17,200,000,000 12,376,000,000    
Market risk benefit assets, at fair value 912,000,000 796,000,000 $ 338,000,000 $ 338,000,000
Separate account assets 91,005,000,000 84,853,000,000    
Liabilities:        
Policyholder contract deposits 161,979,000,000 155,984,000,000 148,223,000,000  
Market risk benefit liabilities, at fair value 5,705,000,000 4,736,000,000 $ 8,739,000,000 $ 8,739,000,000
Derivative liabilities 5,309,000,000 6,043,000,000    
Counterparty netting (3,864,000,000) (3,895,000,000)    
Cash Collateral $ (1,050,000,000) $ (1,917,000,000)    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities(c) Other liabilities(c)    
Total derivative liabilities $ 395,000,000 $ 231,000,000    
Fortitude Re funds withheld payable (29,484,000,000) (30,383,000,000)    
Fair Value Using NAV Per Share (or its equivalent) 11,320,000,000 11,809,000,000    
Short-term and long-term debt 22,387,000,000 27,179,000,000    
Estimated Fair Value        
Assets:        
Short-term investments 6,428,000,000 6,668,000,000    
Liabilities:        
Fortitude Re funds withheld payable (30,710,000,000) (32,618,000,000)    
Carrying Value        
Assets:        
Short-term investments 6,428,000,000 6,668,000,000    
Liabilities:        
Fortitude Re funds withheld payable (30,710,000,000) (32,618,000,000)    
Consolidated Entities, Excluding Consolidated Investments        
Liabilities:        
Short-term and long-term debt 19,796,000,000 21,299,000,000    
Consolidated Entities, Excluding Consolidated Investments | Estimated Fair Value        
Liabilities:        
Short-term and long-term debt 18,862,000,000 19,603,000,000    
Consolidated Entities, Excluding Consolidated Investments | Carrying Value        
Liabilities:        
Short-term and long-term debt 19,743,000,000 21,243,000,000    
Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary        
Liabilities:        
Short-term and long-term debt [1] 2,591,000,000 5,880,000,000    
Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary | Estimated Fair Value        
Liabilities:        
Debt 2,569,000,000 5,533,000,000    
Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary | Carrying Value        
Liabilities:        
Debt 2,591,000,000 5,880,000,000    
U.S. government and government sponsored entities        
Assets:        
Bonds available for sale 5,616,000,000 6,619,000,000    
Obligations of states, municipalities and political subdivisions        
Assets:        
Bonds available for sale 10,663,000,000 12,099,000,000    
Non-U.S. governments        
Assets:        
Bonds available for sale 12,453,000,000 13,485,000,000    
Corporate debt        
Assets:        
Bonds available for sale 138,432,000,000 137,839,000,000    
RMBS        
Assets:        
Bonds available for sale 20,444,000,000 18,817,000,000    
CMBS        
Assets:        
Bonds available for sale 14,128,000,000 14,193,000,000    
CLO/ABS        
Assets:        
Bonds available for sale 29,997,000,000 23,104,000,000    
Level 1 | Estimated Fair Value        
Assets:        
Short-term investments 0 0    
Liabilities:        
Fortitude Re funds withheld payable 0 0    
Level 1 | Consolidated Entities, Excluding Consolidated Investments | Estimated Fair Value        
Liabilities:        
Short-term and long-term debt 0 0    
Level 1 | Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary | Estimated Fair Value        
Liabilities:        
Debt 0 0    
Level 2 | Estimated Fair Value        
Assets:        
Short-term investments 6,428,000,000 6,668,000,000    
Liabilities:        
Fortitude Re funds withheld payable 0 0    
Level 2 | Consolidated Entities, Excluding Consolidated Investments | Estimated Fair Value        
Liabilities:        
Short-term and long-term debt 18,595,000,000 19,328,000,000    
Level 2 | Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary | Estimated Fair Value        
Liabilities:        
Debt 43,000,000 3,055,000,000    
Level 3        
Liabilities:        
Policyholder contract deposits 1,500,000,000 1,100,000,000    
Level 3 | Estimated Fair Value        
Assets:        
Short-term investments 0 0    
Liabilities:        
Fortitude Re funds withheld payable (30,710,000,000) (32,618,000,000)    
Level 3 | Consolidated Entities, Excluding Consolidated Investments | Estimated Fair Value        
Liabilities:        
Short-term and long-term debt 267,000,000 275,000,000    
Level 3 | Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary | Estimated Fair Value        
Liabilities:        
Debt 2,526,000,000 2,478,000,000    
Level 3 | Obligations of states, municipalities and political subdivisions        
Assets:        
Bonds available for sale 824,000,000 799,000,000    
Level 3 | Corporate debt        
Assets:        
Bonds available for sale 1,803,000,000 2,527,000,000    
Level 3 | RMBS        
Assets:        
Bonds available for sale 4,656,000,000 5,235,000,000    
Level 3 | CMBS        
Assets:        
Bonds available for sale 587,000,000 587,000,000    
Fair Value Measured at Net Asset Value Per Share        
Liabilities:        
Fair Value Using NAV Per Share (or its equivalent) 9,500,000,000 9,800,000,000    
Recurring Basis        
Assets:        
Counterparty netting (3,864,000,000) (3,895,000,000)    
Cash Collateral (2,220,000,000) (1,640,000,000)    
Counterparty netting and cash collateral (6,084,000,000) (5,535,000,000)    
Total derivative assets 511,000,000 514,000,000    
Short-term investments 10,772,000,000 5,708,000,000    
Market risk benefit assets, at fair value 912,000,000 796,000,000    
Liabilities:        
Policyholder contract deposits 7,997,000,000 5,408,000,000    
Market risk benefit liabilities, at fair value 5,705,000,000 4,736,000,000    
Counterparty netting (3,864,000,000) (3,895,000,000)    
Cash Collateral (1,050,000,000) (1,917,000,000)    
Counterparty netting and cash collateral (4,914,000,000) (5,812,000,000)    
Total derivative liabilities 395,000,000 231,000,000    
Fortitude Re funds withheld payable (1,226,000,000) (2,235,000,000)    
Other liabilities 624,000,000 343,000,000    
Long-term debt 53,000,000 56,000,000    
Recurring Basis | Levels 1, 2 and 3        
Assets:        
Bonds available for sale 231,733,000,000 226,156,000,000    
Other bond securities, at fair value (See Note 5) 5,241,000,000 4,485,000,000    
Equity securities 728,000,000 575,000,000    
Other invested assets 2,225,000,000 2,220,000,000    
Short-term investments 10,772,000,000 5,708,000,000    
Other assets 243,000,000 107,000,000    
Separate account assets 91,005,000,000 84,853,000,000    
Total(d) 343,370,000,000 325,414,000,000    
Liabilities:        
Policyholder contract deposits 7,997,000,000 5,408,000,000    
Fortitude Re funds withheld payable (1,226,000,000)      
Fortitude Re funds withheld payable   (2,235,000,000)    
Other liabilities 229,000,000 112,000,000    
Long-term debt 53,000,000 56,000,000    
Total 13,153,000,000 8,308,000,000    
Recurring Basis | Levels 1, 2 and 3 | Discontinued Operations, Excluding Held-for-Sale        
Assets:        
Total(d)   182,000,000    
Recurring Basis | Levels 1, 2 and 3 | Interest rate contracts        
Assets:        
Derivative assets 3,286,000,000 3,722,000,000    
Liabilities:        
Derivative liabilities 3,631,000,000 4,838,000,000    
Recurring Basis | Levels 1, 2 and 3 | Foreign exchange contracts        
Assets:        
Derivative assets 1,236,000,000 1,844,000,000    
Liabilities:        
Derivative liabilities 894,000,000 1,138,000,000    
Recurring Basis | Levels 1, 2 and 3 | Equity contracts        
Assets:        
Derivative assets 2,019,000,000 428,000,000    
Liabilities:        
Derivative liabilities 745,000,000 26,000,000    
Recurring Basis | Levels 1, 2 and 3 | Commodity contracts        
Assets:        
Derivative assets   9,000,000    
Recurring Basis | Levels 1, 2 and 3 | Credit contracts        
Assets:        
Derivative assets 41,000,000 32,000,000    
Liabilities:        
Derivative liabilities 37,000,000 41,000,000    
Recurring Basis | Levels 1, 2 and 3 | Other contracts        
Assets:        
Derivative assets 13,000,000 14,000,000    
Liabilities:        
Derivative liabilities 2,000,000      
Recurring Basis | Levels 1, 2 and 3 | U.S. government and government sponsored entities        
Assets:        
Bonds available for sale 5,616,000,000 6,619,000,000    
Recurring Basis | Levels 1, 2 and 3 | Obligations of states, municipalities and political subdivisions        
Assets:        
Bonds available for sale 10,663,000,000 12,099,000,000    
Other bond securities, at fair value (See Note 5) 91,000,000 111,000,000    
Recurring Basis | Levels 1, 2 and 3 | Non-U.S. governments        
Assets:        
Bonds available for sale 12,453,000,000 13,485,000,000    
Other bond securities, at fair value (See Note 5) 37,000,000 66,000,000    
Recurring Basis | Levels 1, 2 and 3 | Corporate debt        
Assets:        
Bonds available for sale 138,432,000,000 137,839,000,000    
Other bond securities, at fair value (See Note 5) 2,908,000,000 2,392,000,000    
Recurring Basis | Levels 1, 2 and 3 | RMBS        
Assets:        
Bonds available for sale 20,444,000,000 18,817,000,000    
Other bond securities, at fair value (See Note 5) 263,000,000 286,000,000    
Recurring Basis | Levels 1, 2 and 3 | CMBS        
Assets:        
Bonds available for sale 14,128,000,000 14,193,000,000    
Other bond securities, at fair value (See Note 5) 261,000,000 331,000,000    
Recurring Basis | Levels 1, 2 and 3 | CLO/ABS        
Assets:        
Bonds available for sale 29,997,000,000 23,104,000,000    
Other bond securities, at fair value (See Note 5) 1,681,000,000 1,299,000,000    
Recurring Basis | Level 1        
Assets:        
Bonds available for sale 268,000,000 183,000,000    
Other bond securities, at fair value (See Note 5) 0 0    
Equity securities 632,000,000 518,000,000    
Other invested assets 0 0    
Derivative assets 7,000,000 12,000,000    
Short-term investments 2,635,000,000 2,821,000,000    
Market risk benefit assets, at fair value 0 0    
Other assets 0 0    
Separate account assets 87,814,000,000 81,655,000,000    
Total(d) 91,356,000,000 85,189,000,000    
Liabilities:        
Policyholder contract deposits 0 0    
Market risk benefit liabilities, at fair value 0 0    
Derivative liabilities 2,000,000 2,000,000    
Fortitude Re funds withheld payable 0      
Fortitude Re funds withheld payable   0    
Other liabilities 0 0    
Long-term debt 0 0    
Total 2,000,000 2,000,000    
Recurring Basis | Level 1 | Interest rate contracts        
Assets:        
Derivative assets 0 1,000,000    
Liabilities:        
Derivative liabilities 0 0    
Recurring Basis | Level 1 | Foreign exchange contracts        
Assets:        
Derivative assets 0 0    
Liabilities:        
Derivative liabilities 0 0    
Recurring Basis | Level 1 | Equity contracts        
Assets:        
Derivative assets 7,000,000 11,000,000    
Liabilities:        
Derivative liabilities 2,000,000 2,000,000    
Recurring Basis | Level 1 | Commodity contracts        
Assets:        
Derivative assets   0    
Recurring Basis | Level 1 | Credit contracts        
Assets:        
Derivative assets 0 0    
Liabilities:        
Derivative liabilities 0 0    
Recurring Basis | Level 1 | Other contracts        
Assets:        
Derivative assets 0 0    
Liabilities:        
Derivative liabilities 0      
Recurring Basis | Level 1 | U.S. government and government sponsored entities        
Assets:        
Bonds available for sale 35,000,000 25,000,000    
Recurring Basis | Level 1 | Obligations of states, municipalities and political subdivisions        
Assets:        
Bonds available for sale 0 0    
Other bond securities, at fair value (See Note 5) 0 0    
Recurring Basis | Level 1 | Non-U.S. governments        
Assets:        
Bonds available for sale 233,000,000 158,000,000    
Other bond securities, at fair value (See Note 5) 0 0    
Recurring Basis | Level 1 | Corporate debt        
Assets:        
Bonds available for sale 0 0    
Other bond securities, at fair value (See Note 5) 0 0    
Recurring Basis | Level 1 | RMBS        
Assets:        
Bonds available for sale 0 0    
Other bond securities, at fair value (See Note 5) 0 0    
Recurring Basis | Level 1 | CMBS        
Assets:        
Bonds available for sale 0 0    
Other bond securities, at fair value (See Note 5) 0 0    
Recurring Basis | Level 1 | CLO/ABS        
Assets:        
Bonds available for sale 0 0    
Other bond securities, at fair value (See Note 5) 0 0    
Recurring Basis | Level 2        
Assets:        
Bonds available for sale 204,621,000,000 201,074,000,000    
Other bond securities, at fair value (See Note 5) 3,685,000,000 2,958,000,000    
Equity securities 40,000,000 18,000,000    
Other invested assets 155,000,000 145,000,000    
Derivative assets 5,256,000,000 5,395,000,000    
Short-term investments 8,137,000,000 2,887,000,000    
Market risk benefit assets, at fair value 0 0    
Other assets 0 0    
Separate account assets 3,191,000,000 3,198,000,000    
Total(d) 225,085,000,000 215,675,000,000    
Liabilities:        
Policyholder contract deposits 55,000,000 41,000,000    
Market risk benefit liabilities, at fair value 0 0    
Derivative liabilities 5,206,000,000 5,995,000,000    
Fortitude Re funds withheld payable 0      
Fortitude Re funds withheld payable   0    
Other liabilities 107,000,000 0    
Long-term debt 53,000,000 56,000,000    
Total 5,421,000,000 6,092,000,000    
Recurring Basis | Level 2 | Interest rate contracts        
Assets:        
Derivative assets 2,826,000,000 3,410,000,000    
Liabilities:        
Derivative liabilities 3,631,000,000 4,838,000,000    
Recurring Basis | Level 2 | Foreign exchange contracts        
Assets:        
Derivative assets 1,235,000,000 1,844,000,000    
Liabilities:        
Derivative liabilities 891,000,000 1,138,000,000    
Recurring Basis | Level 2 | Equity contracts        
Assets:        
Derivative assets 1,187,000,000 132,000,000    
Liabilities:        
Derivative liabilities 680,000,000 10,000,000    
Recurring Basis | Level 2 | Commodity contracts        
Assets:        
Derivative assets   9,000,000    
Recurring Basis | Level 2 | Credit contracts        
Assets:        
Derivative assets 8,000,000 0    
Liabilities:        
Derivative liabilities 4,000,000 9,000,000    
Recurring Basis | Level 2 | Other contracts        
Assets:        
Derivative assets 0 0    
Liabilities:        
Derivative liabilities 0      
Recurring Basis | Level 2 | U.S. government and government sponsored entities        
Assets:        
Bonds available for sale 5,581,000,000 6,594,000,000    
Recurring Basis | Level 2 | Obligations of states, municipalities and political subdivisions        
Assets:        
Bonds available for sale 9,816,000,000 11,275,000,000    
Other bond securities, at fair value (See Note 5) 90,000,000 111,000,000    
Recurring Basis | Level 2 | Non-U.S. governments        
Assets:        
Bonds available for sale 12,213,000,000 13,326,000,000    
Other bond securities, at fair value (See Note 5) 37,000,000 66,000,000    
Recurring Basis | Level 2 | Corporate debt        
Assets:        
Bonds available for sale 136,753,000,000 134,992,000,000    
Other bond securities, at fair value (See Note 5) 2,697,000,000 1,976,000,000    
Recurring Basis | Level 2 | RMBS        
Assets:        
Bonds available for sale 12,804,000,000 11,264,000,000    
Other bond securities, at fair value (See Note 5) 105,000,000 113,000,000    
Recurring Basis | Level 2 | CMBS        
Assets:        
Bonds available for sale 13,495,000,000 13,267,000,000    
Other bond securities, at fair value (See Note 5) 244,000,000 303,000,000    
Recurring Basis | Level 2 | CLO/ABS        
Assets:        
Bonds available for sale 13,959,000,000 10,356,000,000    
Other bond securities, at fair value (See Note 5) 512,000,000 389,000,000    
Recurring Basis | Level 3        
Assets:        
Bonds available for sale 26,844,000,000 24,899,000,000    
Other bond securities, at fair value (See Note 5) 1,556,000,000 1,527,000,000    
Equity securities 56,000,000 39,000,000    
Other invested assets 2,070,000,000 2,075,000,000    
Derivative assets 1,332,000,000 642,000,000    
Short-term investments 0 0    
Market risk benefit assets, at fair value 912,000,000 796,000,000    
Other assets 243,000,000 107,000,000    
Separate account assets 0 0    
Total(d) 33,013,000,000 30,085,000,000    
Liabilities:        
Policyholder contract deposits 7,942,000,000 5,367,000,000    
Market risk benefit liabilities, at fair value 5,705,000,000 4,736,000,000    
Derivative liabilities 101,000,000 46,000,000    
Fortitude Re funds withheld payable (1,226,000,000)      
Fortitude Re funds withheld payable   (2,235,000,000)    
Other liabilities 122,000,000 112,000,000    
Long-term debt 0 0    
Total 12,644,000,000 8,026,000,000    
Recurring Basis | Level 3 | Interest rate contracts        
Assets:        
Derivative assets 460,000,000 311,000,000    
Liabilities:        
Derivative liabilities 0 0    
Recurring Basis | Level 3 | Foreign exchange contracts        
Assets:        
Derivative assets 1,000,000 0    
Liabilities:        
Derivative liabilities 3,000,000 0    
Recurring Basis | Level 3 | Equity contracts        
Assets:        
Derivative assets 825,000,000 285,000,000    
Liabilities:        
Derivative liabilities 63,000,000 14,000,000    
Recurring Basis | Level 3 | Commodity contracts        
Assets:        
Derivative assets   0    
Recurring Basis | Level 3 | Credit contracts        
Assets:        
Derivative assets 33,000,000 32,000,000    
Liabilities:        
Derivative liabilities 33,000,000 32,000,000    
Recurring Basis | Level 3 | Other contracts        
Assets:        
Derivative assets 13,000,000 14,000,000    
Liabilities:        
Derivative liabilities 2,000,000      
Recurring Basis | Level 3 | U.S. government and government sponsored entities        
Assets:        
Bonds available for sale 0 0    
Recurring Basis | Level 3 | Obligations of states, municipalities and political subdivisions        
Assets:        
Bonds available for sale 847,000,000 824,000,000    
Other bond securities, at fair value (See Note 5) 1,000,000 0    
Recurring Basis | Level 3 | Non-U.S. governments        
Assets:        
Bonds available for sale 7,000,000 1,000,000    
Other bond securities, at fair value (See Note 5) 0 0    
Recurring Basis | Level 3 | Corporate debt        
Assets:        
Bonds available for sale 1,679,000,000 2,847,000,000    
Other bond securities, at fair value (See Note 5) 211,000,000 416,000,000    
Recurring Basis | Level 3 | RMBS        
Assets:        
Bonds available for sale 7,640,000,000 7,553,000,000    
Other bond securities, at fair value (See Note 5) 158,000,000 173,000,000    
Recurring Basis | Level 3 | CMBS        
Assets:        
Bonds available for sale 633,000,000 926,000,000    
Other bond securities, at fair value (See Note 5) 17,000,000 28,000,000    
Recurring Basis | Level 3 | CLO/ABS        
Assets:        
Bonds available for sale 16,038,000,000 12,748,000,000    
Other bond securities, at fair value (See Note 5) $ 1,169,000,000 $ 910,000,000    
[1] See Note 10 for details of balances associated with variable interest entities.