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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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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 | $ 19,357 | $ 21,494
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 600 | 828
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 29,911 | 28,394
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,844 | 5,556
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 49,268 | 49,888
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 6,444 | 6,384
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 | 18,594 | 21,046
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 577 | 820
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 29,470 | 27,877
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,764 | 5,463
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 48,064 | 48,923
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 6,341 | 6,283
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 | 763 | 448
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 23 | 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 441 | 517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 80 | 93
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,204 | 965
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 103 | 101
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 | 14,280 | 14,741
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 481 | 529
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 19,066 | 18,851
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,610 | 3,682
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 33,346 | 33,592
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4,091 | 4,211
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 | 758 | 347
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 22 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 280 | 347
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 36 | 50
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,038 | 694
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 58 | 57
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 | 185 | 286
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 438 | 469
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 45 | 46
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 623 | 755
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 48 | 51
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 | 219 | 354
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 600 | 593
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 84 | 100
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 819 | 947
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 87 | 107
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 | 1,580 | 940
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 19 | 19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,446 | 1,730
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 149 | 159
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,026 | 2,670
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 168 | 178
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 | 5 | 101
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 31 | 40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6 | 5
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 36 | 141
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 7 | 6
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 | 360 | 333
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 937 | 980
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 78 | 91
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,297 | 1,313
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 85 | 95
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 | 202 | 792
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 | 15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 673 | 656
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 244 | 266
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 875 | 1,448
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 248 | 281
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 | 112 | 155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 434 | 417
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 83 | 92
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 546 | 572
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 86 | 99
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 | 1,308 | 1,408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 49 | 42
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,757 | 1,816
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 348 | 344
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,065 | 3,224
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 397 | 386
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 | 130 | 130
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 38 | 38
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 130 | 130
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 38 | 38
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 | 348 | 2,037
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8 | 192
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4,119 | 2,365
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,123 | 683
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 4,467 | 4,402
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 1,131 | $ 875

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