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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - Fixed Maturities [Member] - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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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 | $ 15,046 | $ 31,631
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 693 | 3,693
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 28,930 | 12,915
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,403 | 3,615
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 43,976 | 44,546
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 6,096 | 7,308
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 | 14,451 | 30,773
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 632 | 3,598
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 28,151 | 12,408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,253 | 3,485
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 42,602 | 43,181
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 5,885 | 7,083
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 | 595 | 858
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 61 | 95
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 779 | 507
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 150 | 130
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,374 | 1,365
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 211 | 225
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 | 9,861 | 21,867
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 486 | 2,756
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 18,130 | 6,840
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,705 | 2,225
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 27,991 | 28,707
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4,191 | 4,981
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 | 550 | 767
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 58 | 87
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 546 | 305
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 79 | 61
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,096 | 1,072
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 137 | 148
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 | 395 | 554
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 15 | 42
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 165 | 71
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 30 | 23
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 560 | 625
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 45 | 65
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 | 332 | 664
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 16 | 62
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 513 | 181
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 82 | 53
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 845 | 845
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 98 | 115
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 | 811 | 1,596
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 38 | 153
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,777 | 1,931
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 311 | 269
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,588 | 3,527
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 349 | 422
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 | 45 | 52
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 46 | 38
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 10 | 9
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 91 | 90
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 13 | 15
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 | 341 | 1,314
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 20 | 144
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,271 | 281
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 188 | 65
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,612 | 1,595
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 208 | 209
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 | 909 | 1,202
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5 | 64
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 606 | 253
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 179 | 148
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,515 | 1,455
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 184 | 212
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 | 350 | 819
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10 | 124
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 635 | 131
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 122 | 50
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 985 | 950
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 132 | 174
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 | 1,073 | 1,942
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 38 | 167
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,763 | 1,026
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 325 | 260
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,836 | 2,968
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 363 | 427
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 | 39
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 187 | 164
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 61 | 60
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 187 | 203
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 61 | 62
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 | 379 | 815
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 | 86
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,291 | 1,694
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 311 | 392
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,670 | 2,509
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 315 | $ 478

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