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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 | Jun. 30, 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 | $ 13,532 | $ 31,631
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 656 | 3,693
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 31,086 | 12,915
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,937 | 3,615
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 44,618 | 44,546
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 6,593 | 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 | 13,035 | 30,773
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 634 | 3,598
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 30,190 | 12,408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,778 | 3,485
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 43,225 | 43,181
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 6,412 | 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 | 497 | 858
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 22 | 95
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 896 | 507
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 159 | 130
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,393 | 1,365
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 181 | 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 | 9,095 | 21,867
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 496 | 2,756
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 19,800 | 6,840
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,161 | 2,225
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 28,895 | 28,707
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4,657 | 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 | 481 | 767
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 21 | 87
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 660 | 305
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 83 | 61
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,141 | 1,072
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 104 | 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 | 436 | 554
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 17 | 42
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 168 | 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 | 604 | 625
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 47 | 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 | 385 | 664
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 17 | 62
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 532 | 181
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 94 | 53
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 917 | 845
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 111 | 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 | 503 | 1,596
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 17 | 153
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,069 | 1,931
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 316 | 269
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,572 | 3,527
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 333 | 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 | 16 | 52
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 53 | 38
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 13 | 9
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 69 | 90
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 14 | 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 | 331 | 1,314
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 16 | 144
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,311 | 281
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 212 | 65
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,642 | 1,595
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 228 | 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 | 749 | 1,202
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 14 | 64
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 596 | 253
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 194 | 148
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,345 | 1,455
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 208 | 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 | 303 | 819
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 13 | 124
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 660 | 131
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 132 | 50
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 963 | 950
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 145 | 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 | 988 | 1,942
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 42 | 167
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,900 | 1,026
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 362 | 260
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,888 | 2,968
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 404 | 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 | 183 | 164
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 63 | 60
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 183 | 203
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 63 | 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 | 245 | 815
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 86
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,154 | 1,694
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 277 | 392
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,399 | 2,509
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 279 | $ 478

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