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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 9,119 | $ 4,857
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 298 | 183
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 32,122 | 36,678
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,776 | 5,370
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 41,241 | 41,535
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 5,074 | 5,553
Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 8,714 | 4,562
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 282 | 147
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 31,475 | 35,764
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,661 | 5,186
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 40,189 | 40,326
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4,943 | 5,333
Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 405 | 295
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 16 | 36
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 647 | 914
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 115 | 184
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,052 | 1,209
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 131 | 220
Corporate Debt Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 3,871 | 2,134
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 71 | 70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 21,471 | 24,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,036 | 3,524
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 25,342 | 26,341
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 3,107 | 3,594
Corporate Debt Securities [Member] | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 392 | 295
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 14 | 36
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 413 | 649
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 62 | 121
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 805 | 944
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 76 | 157
Canadian and Canadian provincial governments | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 159 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 432 | 459
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 35 | 33
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 591 | 459
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 41 | 33
Residential mortgage-backed securities | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 115
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 636 | 681
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 76 | 99
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 636 | 796
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 76 | 102
Asset-backed Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,054 | 336
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 22 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,039 | 3,025
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 148 | 223
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,093 | 3,361
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 170 | 228
Asset-backed Securities [Member] | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 13 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 44 | 68
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5 | 10
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 57 | 68
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 7 | 10
Commercial mortgage-backed securities | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 188 | 160
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 12 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,156 | 1,328
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 96 | 190
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,344 | 1,488
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 108 | 195
Commercial mortgage-backed securities | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 1
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 0 | 4
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0 | 1
US Government Agencies Debt Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 264 | 614
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 711 | 717
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 210 | 204
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 975 | 1,331
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 212 | 214
US States and Political Subdivisions Debt Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 73
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 532 | 864
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 81 | 128
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 532 | 937
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 81 | 129
Debt Security, Government, Non-US [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 770 | 254
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,009 | 2,290
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 302 | 333
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,779 | 2,544
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 312 | 336
Debt Security, Government, Non-US [Member] | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 190 | 193
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 48 | 52
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 190 | 193
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 48 | 52
JAPAN | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,408 | 876
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 159 | 50
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,489 | 2,193
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 677 | 452
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 4,897 | 3,069
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 836 | $ 502

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