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Investments - Available-for-sale Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Gross Unrealized Losses [Abstract] |  |
Total, Estimated Fair Value | $ 29,612 | $ 29,511
Total, Gross Unrealized Losses | 3,786 | 4,056
Fixed maturity securities |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 11,350 | 25,234
Less than 12 Months, Gross Unrealized Losses | 506 | 2,946
12 Months or Longer, Estimated Fair Value | 18,262 | 4,277
12 Months or Longer, Gross Unrealized Losses | 3,280 | 1,110
Total, Estimated Fair Value | 29,612 | 29,511
Total, Gross Unrealized Losses | 3,786 | 4,056
Corporate bonds and other |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 7,681 | 15,946
Less than 12 Months, Gross Unrealized Losses | 350 | 1,585
12 Months or Longer, Estimated Fair Value | 10,087 | 1,634
12 Months or Longer, Gross Unrealized Losses | 1,559 | 424
Total, Estimated Fair Value | 17,768 | 17,580
Total, Gross Unrealized Losses | 1,909 | 2,009
States, municipalities and political subdivisions |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 1,486 | 4,079
Less than 12 Months, Gross Unrealized Losses | 64 | 769
12 Months or Longer, Estimated Fair Value | 2,783 | 456
12 Months or Longer, Gross Unrealized Losses | 729 | 170
Total, Estimated Fair Value | 4,269 | 4,535
Total, Gross Unrealized Losses | 793 | 939
Residential mortgage-backed |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 822 | 1,406
Less than 12 Months, Gross Unrealized Losses | 35 | 144
12 Months or Longer, Estimated Fair Value | 1,810 | 1,143
12 Months or Longer, Gross Unrealized Losses | 409 | 303
Total, Estimated Fair Value | 2,632 | 2,549
Total, Gross Unrealized Losses | 444 | 447
Commercial mortgage-backed |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 325 | 1,167
Less than 12 Months, Gross Unrealized Losses | 15 | 159
12 Months or Longer, Estimated Fair Value | 1,171 | 408
12 Months or Longer, Gross Unrealized Losses | 242 | 96
Total, Estimated Fair Value | 1,496 | 1,575
Total, Gross Unrealized Losses | 257 | 255
Other asset-backed |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 739 | 2,087
Less than 12 Months, Gross Unrealized Losses | 32 | 262
12 Months or Longer, Estimated Fair Value | 1,982 | 542
12 Months or Longer, Gross Unrealized Losses | 298 | 99
Total, Estimated Fair Value | 2,721 | 2,629
Total, Gross Unrealized Losses | 330 | 361
Total asset-backed |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 1,886 | 4,660
Less than 12 Months, Gross Unrealized Losses | 82 | 565
12 Months or Longer, Estimated Fair Value | 4,963 | 2,093
12 Months or Longer, Gross Unrealized Losses | 949 | 498
Total, Estimated Fair Value | 6,849 | 6,753
Total, Gross Unrealized Losses | 1,031 | 1,063
U.S. Treasury and obligations of government-sponsored enterprises |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 84 | 76
Less than 12 Months, Gross Unrealized Losses | 2 | 1
12 Months or Longer, Estimated Fair Value | 34 | 16
12 Months or Longer, Gross Unrealized Losses | 1 | 1
Total, Estimated Fair Value | 118 | 92
Total, Gross Unrealized Losses | 3 | 2
Foreign government |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 213 | 473
Less than 12 Months, Gross Unrealized Losses | 8 | 26
12 Months or Longer, Estimated Fair Value | 395 | 78
12 Months or Longer, Gross Unrealized Losses | 42 | 17
Total, Estimated Fair Value | 608 | 551
Total, Gross Unrealized Losses | $ 50 | $ 43

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