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Investments - Available-for-sale Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Gross Unrealized Losses [Abstract] |  |
Total, Estimated Fair Value | $ 29,944 | $ 6,065
Total, Gross Unrealized Losses | 4,583 | 112
Fixed maturity securities |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 28,394 | 5,695
Less than 12 Months, Gross Unrealized Losses | 4,152 | 92
12 Months or Longer, Estimated Fair Value | 1,550 | 370
12 Months or Longer, Gross Unrealized Losses | 431 | 20
Total, Estimated Fair Value | 29,944 | 6,065
Total, Gross Unrealized Losses | 4,583 | 112
Corporate and Other Bonds |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 16,707 | 2,389
Less than 12 Months, Gross Unrealized Losses | 2,117 | 48
12 Months or Longer, Estimated Fair Value | 914 | 136
12 Months or Longer, Gross Unrealized Losses | 281 | 8
Total, Estimated Fair Value | 17,621 | 2,525
Total, Gross Unrealized Losses | 2,398 | 56
States, municipalities and political subdivisions |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 4,793 | 730
Less than 12 Months, Gross Unrealized Losses | 1,029 | 14
12 Months or Longer, Estimated Fair Value | 128 |
12 Months or Longer, Gross Unrealized Losses | 51 |
Total, Estimated Fair Value | 4,921 | 730
Total, Gross Unrealized Losses | 1,080 | 14
Residential mortgage-backed |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 2,582 | 1,043
Less than 12 Months, Gross Unrealized Losses | 462 | 8
12 Months or Longer, Estimated Fair Value | 17 |
12 Months or Longer, Gross Unrealized Losses | 8 |
Total, Estimated Fair Value | 2,599 | 1,043
Total, Gross Unrealized Losses | 470 | 8
Commercial mortgage-backed |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 1,372 | 527
Less than 12 Months, Gross Unrealized Losses | 194 | 7
12 Months or Longer, Estimated Fair Value | 233 | 167
12 Months or Longer, Gross Unrealized Losses | 43 | 12
Total, Estimated Fair Value | 1,605 | 694
Total, Gross Unrealized Losses | 237 | 19
Other asset-backed |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 2,433 | 840
Less than 12 Months, Gross Unrealized Losses | 307 | 10
12 Months or Longer, Estimated Fair Value | 233 | 62
12 Months or Longer, Gross Unrealized Losses | 42 |
Total, Estimated Fair Value | 2,666 | 902
Total, Gross Unrealized Losses | 349 | 10
Total asset-backed |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 6,387 | 2,410
Less than 12 Months, Gross Unrealized Losses | 963 | 25
12 Months or Longer, Estimated Fair Value | 483 | 229
12 Months or Longer, Gross Unrealized Losses | 93 | 12
Total, Estimated Fair Value | 6,870 | 2,639
Total, Gross Unrealized Losses | 1,056 | 37
U.S. Treasury and obligations of government-sponsored enterprises |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 61 | 69
Less than 12 Months, Gross Unrealized Losses | 1 | 3
12 Months or Longer, Estimated Fair Value |  | 5
12 Months or Longer, Gross Unrealized Losses |  |
Total, Estimated Fair Value | 61 | 74
Total, Gross Unrealized Losses | 1 | 3
Foreign government |  |
Gross Unrealized Losses [Abstract] |  |
Less than 12 Months, Estimated Fair Value | 446 | 97
Less than 12 Months, Gross Unrealized Losses | 42 | 2
12 Months or Longer, Estimated Fair Value | 25 |
12 Months or Longer, Gross Unrealized Losses | 6 |
Total, Estimated Fair Value | 471 | 97
Total, Gross Unrealized Losses | $ 48 | $ 2

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