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Investments - Unrealized Loss Position (Details)
$ in Millions
Sep. 30, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 11,362 3,700
Number of Securities, Greater than 12 months | security 1,609 317
Number of Securities | security 12,971 4,017
Fair Value    
Fair Value, Less than 12 months $ 16,967 $ 6,800
Fair Value, Greater than 12 months 2,489 584
Fair Value 19,456 7,384
Unrealized Losses    
Unrealized Losses, Less than 12 months 1,786 84
Unrealized Losses, Greater than 12 months 439 22
Unrealized Losses $ 2,225 $ 106
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 570 43
Number of Securities, Greater than 12 months | security 25 10
Number of Securities | security 595 53
Fair Value    
Fair Value, Less than 12 months $ 1,845 $ 242
Fair Value, Greater than 12 months 125 40
Fair Value 1,970 282
Unrealized Losses    
Unrealized Losses, Less than 12 months 179 2
Unrealized Losses, Greater than 12 months 12 1
Unrealized Losses $ 191 $ 3
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 1,129 233
Number of Securities, Greater than 12 months | security 122 13
Number of Securities | security 1,251 246
Fair Value    
Fair Value, Less than 12 months $ 1,949 $ 428
Fair Value, Greater than 12 months 207 33
Fair Value 2,156 461
Unrealized Losses    
Unrealized Losses, Less than 12 months 153 3
Unrealized Losses, Greater than 12 months 29 1
Unrealized Losses $ 182 $ 4
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 6,083 1,610
Number of Securities, Greater than 12 months | security 848 165
Number of Securities | security 6,931 1,775
Fair Value    
Fair Value, Less than 12 months $ 7,503 $ 2,296
Fair Value, Greater than 12 months 1,027 238
Fair Value 8,530 2,534
Unrealized Losses    
Unrealized Losses, Less than 12 months 889 31
Unrealized Losses, Greater than 12 months 191 9
Unrealized Losses $ 1,080 $ 40
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 1,443 449
Number of Securities, Greater than 12 months | security 254 57
Number of Securities | security 1,697 506
Fair Value    
Fair Value, Less than 12 months $ 2,005 $ 747
Fair Value, Greater than 12 months 383 91
Fair Value 2,388 838
Unrealized Losses    
Unrealized Losses, Less than 12 months 246 20
Unrealized Losses, Greater than 12 months 78 4
Unrealized Losses $ 324 $ 24
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 489 165
Number of Securities, Greater than 12 months | security 69 10
Number of Securities | security 558 175
Fair Value    
Fair Value, Less than 12 months $ 562 $ 593
Fair Value, Greater than 12 months 187 36
Fair Value 749 629
Unrealized Losses    
Unrealized Losses, Less than 12 months 68 9
Unrealized Losses, Greater than 12 months 41 1
Unrealized Losses $ 109 $ 10
Commercial mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 368 188
Number of Securities, Greater than 12 months | security 127 35
Number of Securities | security 495 223
Fair Value    
Fair Value, Less than 12 months $ 772 $ 462
Fair Value, Greater than 12 months 265 112
Fair Value 1,037 574
Unrealized Losses    
Unrealized Losses, Less than 12 months 101 7
Unrealized Losses, Greater than 12 months 65 5
Unrealized Losses $ 166 $ 12
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 1,266 1,011
Number of Securities, Greater than 12 months | security 163 26
Number of Securities | security 1,429 1,037
Fair Value    
Fair Value, Less than 12 months $ 2,311 $ 2,030
Fair Value, Greater than 12 months 292 31
Fair Value 2,603 2,061
Unrealized Losses    
Unrealized Losses, Less than 12 months 148 12
Unrealized Losses, Greater than 12 months 23 1
Unrealized Losses $ 171 $ 13
Redeemable preferred securities    
Number of Securities    
Number of Securities, Less than 12 months | security 14 1
Number of Securities, Greater than 12 months | security 1 1
Number of Securities | security 15 2
Fair Value    
Fair Value, Less than 12 months $ 20 $ 2
Fair Value, Greater than 12 months 3 3
Fair Value 23 5
Unrealized Losses    
Unrealized Losses, Less than 12 months 2 0
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 2 $ 0