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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, 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 | $ 14,280 | $ 21,494
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 475 | 828
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 31,508 | 28,394
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6,037 | 5,556
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 45,788 | 49,888
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 6,512 | 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 | 13,350 | 21,046
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 424 | 820
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 31,079 | 27,877
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,979 | 5,463
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 44,429 | 48,923
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 6,403 | 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 | 930 | 448
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 51 | 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 429 | 517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 58 | 93
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,359 | 965
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 109 | 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 | 7,386 | 14,741
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 191 | 529
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 21,322 | 18,851
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,481 | 3,682
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 28,708 | 33,592
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 3,672 | 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 | 918 | 347
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 47 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 294 | 347
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 31 | 50
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,212 | 694
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 78 | 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 | 570 | 286
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 16 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 385 | 469
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 59 | 46
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 955 | 755
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 75 | 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 | 0 | 354
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 617 | 593
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 77 | 100
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 617 | 947
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 77 | 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 | 1,989 | 940
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 14 | 19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,161 | 1,730
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 145 | 159
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,150 | 2,670
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 159 | 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 | 12 | 101
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 5
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 12 | 141
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4 | 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 | 109 | 333
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 744 | 980
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 56 | 91
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 853 | 1,313
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 59 | 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 | 0 | 792
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 642 | 656
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 246 | 266
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 642 | 1,448
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 246 | 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 | 47 | 155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 446 | 417
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 79 | 92
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 493 | 572
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 80 | 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 | 1,900 | 1,408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 44 | 42
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,978 | 1,816
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 347 | 344
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,878 | 3,224
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 391 | 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 | 135 | 130
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 27 | 38
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 135 | 130
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 27 | 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 | 1,349 | 2,037
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 155 | 192
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,784 | 2,365
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,489 | 683
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 5,133 | 4,402
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 1,644 | $ 875

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