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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, 2022 | Dec. 31, 2021
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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 | $ 26,488 | $ 10,644
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,677 | 176
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,963 | 2,640
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 376 | 171
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 29,451 | 13,284
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 2,053 | 347
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 | 25,388 | 10,045
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,608 | 156
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,735 | 2,455
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 317 | 104
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 28,123 | 12,500
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1,925 | 260
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 | 1,100 | 599
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 69 | 20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 228 | 185
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 59 | 67
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,328 | 784
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 128 | 87
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 | 15,156 | 4,135
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,082 | 86
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,161 | 946
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 186 | 51
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 16,317 | 5,081
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1,268 | 137
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 | 878 | 463
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 50 | 13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 108 | 97
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 33 | 44
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 986 | 560
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 83 | 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 | 127 | 20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 15 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 142 | 20
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 12 | 1
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 | 400 | 132
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 15 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 137 | 102
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 13 | 4
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 537 | 234
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 28 | 7
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 | 2,632 | 1,747
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 139 | 22
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 604 | 589
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 18 | 6
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,236 | 2,336
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 157 | 28
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 | 22 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 9 | 13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2 | 13
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 31 | 13
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4 | 13
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 | 1,178 | 152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 40 | 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 34 | 35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3 | 2
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,212 | 187
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 43 | 4
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 | 28 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 9 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 37 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 3 | 0
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 | 1,148 | 1,513
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 64 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 27 | 31
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5 | 2
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,175 | 1,544
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 69 | 8
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 | 460 | 109
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 42 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 30 | 28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5 | 2
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 490 | 137
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 47 | 5
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 | 4,287 | 2,237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 218 | 33
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 727 | 724
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 83 | 37
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 5,014 | 2,961
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 301 | 70
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 | 172 | 136
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 15 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 102 | 75
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 23 | 10
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 274 | 211
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 38 | $ 17

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