v3.24.2.u1
Fair Value Measurements - Net realized and unrealized gains and losses included in income related to Level 3 assets and liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets $ 216 $ 54 $ 299 $ 85
Net realized gains (losses), liabilities (146) (336) (261) (1,597)
Policyholder contract deposits        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities (272) (429) (724) (810)
Policyholder contract deposits | Policy Fees        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0 0 0 0
Policyholder contract deposits | Net Investment Income (Loss)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0 0 0 0
Policyholder contract deposits | Net Realized and Unrealized Gains (Losses)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities (272) (429) (724) (810)
Policyholder contract deposits | Change in the Fair Value of Market Risk Benefits, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0 0 0 0
Derivative liabilities, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 90 (28) 405 117
Derivative liabilities, net | Policy Fees        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 14 15 29 31
Derivative liabilities, net | Net Investment Income (Loss)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0 0 0 0
Derivative liabilities, net | Net Realized and Unrealized Gains (Losses)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 76 3 439 231
Derivative liabilities, net | Change in the Fair Value of Market Risk Benefits, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0 (46) (63) (145)
Fortitude Re funds withheld payable        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 36 122 58 (903)
Fortitude Re funds withheld payable | Policy Fees        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0 0 0 0
Fortitude Re funds withheld payable | Net Investment Income (Loss)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0 0 0 0
Fortitude Re funds withheld payable | Net Realized and Unrealized Gains (Losses)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 36 122 58 (903)
Fortitude Re funds withheld payable | Change in the Fair Value of Market Risk Benefits, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0 0 0 0
Market Risk Benefit Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 131 887 1,202 800
Market Risk Benefit Liabilities | Policy Fees        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0 0 0 0
Market Risk Benefit Liabilities | Net Investment Income (Loss)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0 0 0 0
Market Risk Benefit Liabilities | Net Realized and Unrealized Gains (Losses)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 2 3 4 3
Market Risk Benefit Liabilities | Change in the Fair Value of Market Risk Benefits, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 129 884 1,198 797
Debt of consolidated investment entities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities   (1)   (1)
Debt of consolidated investment entities | Policy Fees        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities   0   0
Debt of consolidated investment entities | Net Investment Income (Loss)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities   (1)   (1)
Debt of consolidated investment entities | Net Realized and Unrealized Gains (Losses)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities   0   0
Debt of consolidated investment entities | Change in the Fair Value of Market Risk Benefits, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities   0   0
Bonds available-for-sale        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 194 77 328 114
Bonds available-for-sale | Policy Fees        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Bonds available-for-sale | Net Investment Income (Loss)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 200 118 359 150
Bonds available-for-sale | Net Realized and Unrealized Gains (Losses)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets (6) (41) (31) (36)
Bonds available-for-sale | Change in the Fair Value of Market Risk Benefits, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Other bond securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 26 (4) 52 34
Other bond securities | Policy Fees        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Other bond securities | Net Investment Income (Loss)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 26 (4) 52 34
Other bond securities | Net Realized and Unrealized Gains (Losses)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Other bond securities | Change in the Fair Value of Market Risk Benefits, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Equity securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets (2) 0 1 0
Equity securities | Policy Fees        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Equity securities | Net Investment Income (Loss)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets (2) 0 1 0
Equity securities | Net Realized and Unrealized Gains (Losses)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Equity securities | Change in the Fair Value of Market Risk Benefits, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Other invested assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets (2) (19) (82) (63)
Other invested assets | Policy Fees        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Other invested assets | Net Investment Income (Loss)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets (6) (21) (84) (64)
Other invested assets | Net Realized and Unrealized Gains (Losses)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 4 2 2 1
Other invested assets | Change in the Fair Value of Market Risk Benefits, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets $ 0 $ 0 $ 0 $ 0