v3.24.1.u1
Investments - Securities available for sale in a loss position (Details)
$ in Millions
Mar. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Fair Value    
Less Than 12 Months $ 23,381 $ 23,061
12 Months or More 103,105 105,834
Total 126,486 128,895
Gross Unrealized Losses    
Less Than 12 Months 2,551 2,458
12 Months or More 18,877 17,940
Total $ 21,428 $ 20,398
Number of securities in an unrealized loss position | security 14,892 15,034
Number of individual securities in continuous unrealized loss position for longer than twelve months | security 12,625 12,787
U.S. government and government sponsored entities    
Fair Value    
Less Than 12 Months $ 209 $ 22
12 Months or More 713 746
Total 922 768
Gross Unrealized Losses    
Less Than 12 Months 6 3
12 Months or More 266 230
Total 272 233
Obligations of states, municipalities and political subdivisions    
Fair Value    
Less Than 12 Months 975 1,124
12 Months or More 3,580 3,676
Total 4,555 4,800
Gross Unrealized Losses    
Less Than 12 Months 110 110
12 Months or More 620 583
Total 730 693
Non-U.S. governments    
Fair Value    
Less Than 12 Months 646 470
12 Months or More 2,832 2,981
Total 3,478 3,451
Gross Unrealized Losses    
Less Than 12 Months 105 82
12 Months or More 654 592
Total 759 674
Corporate debt    
Fair Value    
Less Than 12 Months 12,342 11,338
12 Months or More 72,528 75,045
Total 84,870 86,383
Gross Unrealized Losses    
Less Than 12 Months 2,040 1,760
12 Months or More 14,798 14,009
Total 16,838 15,769
RMBS    
Fair Value    
Less Than 12 Months 2,889 2,676
12 Months or More 5,354 4,855
Total 8,243 7,531
Gross Unrealized Losses    
Less Than 12 Months 121 174
12 Months or More 678 577
Total 799 751
CMBS    
Fair Value    
Less Than 12 Months 828 1,840
12 Months or More 6,766 6,570
Total 7,594 8,410
Gross Unrealized Losses    
Less Than 12 Months 35 159
12 Months or More 898 886
Total 933 1,045
CLO    
Fair Value    
Less Than 12 Months 2,550 2,992
12 Months or More 3,047 3,823
Total 5,597 6,815
Gross Unrealized Losses    
Less Than 12 Months 24 60
12 Months or More 61 89
Total 85 149
ABS    
Fair Value    
Less Than 12 Months 2,942 2,599
12 Months or More 8,285 8,138
Total 11,227 10,737
Gross Unrealized Losses    
Less Than 12 Months 110 110
12 Months or More 902 974
Total $ 1,012 $ 1,084