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Investments - Unrealized Loss Position (Details)
$ in Millions
Jun. 30, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 10,384 3,700
Number of Securities, Greater than 12 months | security 690 317
Number of Securities | security 11,074 4,017
Fair Value    
Fair Value, Less than 12 months $ 15,825 $ 6,800
Fair Value, Greater than 12 months 1,093 584
Fair Value 16,918 7,384
Unrealized Losses    
Unrealized Losses, Less than 12 months 1,367 84
Unrealized Losses, Greater than 12 months 148 22
Unrealized Losses $ 1,515 $ 106
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 464 43
Number of Securities, Greater than 12 months | security 12 10
Number of Securities | security 476 53
Fair Value    
Fair Value, Less than 12 months $ 1,616 $ 242
Fair Value, Greater than 12 months 58 40
Fair Value 1,674 282
Unrealized Losses    
Unrealized Losses, Less than 12 months 115 2
Unrealized Losses, Greater than 12 months 3 1
Unrealized Losses $ 118 $ 3
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 875 233
Number of Securities, Greater than 12 months | security 27 13
Number of Securities | security 902 246
Fair Value    
Fair Value, Less than 12 months $ 1,372 $ 428
Fair Value, Greater than 12 months 55 33
Fair Value 1,427 461
Unrealized Losses    
Unrealized Losses, Less than 12 months 104 3
Unrealized Losses, Greater than 12 months 6 1
Unrealized Losses $ 110 $ 4
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 5,583 1,610
Number of Securities, Greater than 12 months | security 364 165
Number of Securities | security 5,947 1,775
Fair Value    
Fair Value, Less than 12 months $ 6,989 $ 2,296
Fair Value, Greater than 12 months 508 238
Fair Value 7,497 2,534
Unrealized Losses    
Unrealized Losses, Less than 12 months 674 31
Unrealized Losses, Greater than 12 months 66 9
Unrealized Losses $ 740 $ 40
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 1,304 449
Number of Securities, Greater than 12 months | security 119 57
Number of Securities | security 1,423 506
Fair Value    
Fair Value, Less than 12 months $ 1,872 $ 747
Fair Value, Greater than 12 months 172 91
Fair Value 2,044 838
Unrealized Losses    
Unrealized Losses, Less than 12 months 206 20
Unrealized Losses, Greater than 12 months 30 4
Unrealized Losses $ 236 $ 24
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 388 165
Number of Securities, Greater than 12 months | security 23 10
Number of Securities | security 411 175
Fair Value    
Fair Value, Less than 12 months $ 644 $ 593
Fair Value, Greater than 12 months 65 36
Fair Value 709 629
Unrealized Losses    
Unrealized Losses, Less than 12 months 50 9
Unrealized Losses, Greater than 12 months 11 1
Unrealized Losses $ 61 $ 10
Commercial mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 436 188
Number of Securities, Greater than 12 months | security 53 35
Number of Securities | security 489 223
Fair Value    
Fair Value, Less than 12 months $ 955 $ 462
Fair Value, Greater than 12 months 118 112
Fair Value 1,073 574
Unrealized Losses    
Unrealized Losses, Less than 12 months 91 7
Unrealized Losses, Greater than 12 months 23 5
Unrealized Losses $ 114 $ 12
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 1,324 1,011
Number of Securities, Greater than 12 months | security 91 26
Number of Securities | security 1,415 1,037
Fair Value    
Fair Value, Less than 12 months $ 2,358 $ 2,030
Fair Value, Greater than 12 months 114 31
Fair Value 2,472 2,061
Unrealized Losses    
Unrealized Losses, Less than 12 months 126 12
Unrealized Losses, Greater than 12 months 9 1
Unrealized Losses $ 135 $ 13
Redeemable preferred securities    
Number of Securities    
Number of Securities, Less than 12 months | security 10 1
Number of Securities, Greater than 12 months | security 1 1
Number of Securities | security 11 2
Fair Value    
Fair Value, Less than 12 months $ 19 $ 2
Fair Value, Greater than 12 months 3 3
Fair Value 22 5
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 0
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 1 $ 0