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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Millions | Jun. 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 | $ 14,406 | $ 4,857
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 458 | 183
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 33,741 | 36,678
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6,049 | 5,370
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 48,147 | 41,535
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 6,507 | 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 | 14,045 | 4,562
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 449 | 147
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 33,027 | 35,764
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,919 | 5,186
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 47,072 | 40,326
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 6,368 | 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 | 361 | 295
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9 | 36
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 714 | 914
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 130 | 184
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,075 | 1,209
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 139 | 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 | 8,885 | 2,134
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 217 | 70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 22,555 | 24,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,043 | 3,524
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 31,440 | 26,341
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4,260 | 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 | 352 | 295
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8 | 36
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 476 | 649
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 68 | 121
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 828 | 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 | 404 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 15 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 449 | 459
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 56 | 33
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 853 | 459
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 71 | 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 | 137 | 115
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 721 | 681
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 108 | 99
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 858 | 796
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 109 | 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 | 794 | 336
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,310 | 3,025
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 175 | 223
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,104 | 3,361
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 183 | 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 | 9 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 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 | 53 | 68
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 6 | 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 | 270 | 160
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,225 | 1,328
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 129 | 190
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,495 | 1,488
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 131 | 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 | 422 | 614
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 | 10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 736 | 717
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 252 | 204
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,158 | 1,331
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 256 | 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 | 114 | 73
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 | 785 | 864
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 146 | 128
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 899 | 937
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 150 | 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 | 726 | 254
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 11 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,110 | 2,290
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 362 | 333
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,836 | 2,544
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 373 | 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 | 194 | 193
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 57 | 52
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 194 | 193
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 57 | 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 | 2,293 | 876
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 187 | 50
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,136 | 2,193
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 648 | 452
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 4,429 | 3,069
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 835 | $ 502

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