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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, 2021 | Dec. 31, 2020
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Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | $ 9,599 | $ 4,068
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 391 | 163
Estimated Fair Value - 12 months or greater | 2,058 | 769
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 99 | 34
Estimated Fair Value | 11,657 | 4,837
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 490 | 197
Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 386 | 522
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 50 | 80
Estimated Fair Value - 12 months or greater | 311 | 113
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 45 | 15
Estimated Fair Value | 697 | 635
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 95 | 95
Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 9,213 | 3,546
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 341 | 83
Estimated Fair Value - 12 months or greater | 1,747 | 656
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 54 | 19
Estimated Fair Value | 10,960 | 4,202
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 395 | 102
Corporate Debt Securities [Member] | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 258 | 375
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 45 | 49
Estimated Fair Value - 12 months or greater | 226 | 81
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 22 | 11
Estimated Fair Value | 484 | 456
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 67 | 60
Corporate Debt Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 4,794 | 930
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 211 | 29
Estimated Fair Value - 12 months or greater | 219 | 70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 10 | 5
Estimated Fair Value | 5,013 | 1,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 221 | 34
Canadian and Canadian provincial governments | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 29 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 0
Estimated Fair Value - 12 months or greater | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Estimated Fair Value | 29 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 3 | 0
Residential mortgage-backed securities | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 323 | 294
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7 | 2
Estimated Fair Value - 12 months or greater | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Estimated Fair Value | 323 | 294
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 7 | 2
Asset-backed Securities [Member] | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 0 | 20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 13
Estimated Fair Value - 12 months or greater | 15 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 12 | 1
Estimated Fair Value | 15 | 24
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 12 | 14
Asset-backed Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 793 | 1,096
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6 | 17
Estimated Fair Value - 12 months or greater | 933 | 570
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 12 | 11
Estimated Fair Value | 1,726 | 1,666
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 18 | 28
Commercial mortgage-backed securities | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 42 | 91
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 |
Estimated Fair Value - 12 months or greater | 44 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6 |
Estimated Fair Value | 86 | 91
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 15
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 7 |
Commercial mortgage-backed securities | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 103 | 160
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 6
Estimated Fair Value - 12 months or greater | 68 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2 | 0
Estimated Fair Value | 171 | 160
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4 | 6
US Government Agencies Debt Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 431 | 27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 53 | 1
Estimated Fair Value - 12 months or greater | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Estimated Fair Value | 431 | 27
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 53 | 1
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] |  |
Estimated Fair Value - Less than 12 months | 271 | 66
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9 | 1
Estimated Fair Value - 12 months or greater | 29 | 16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5 | 3
Estimated Fair Value | 300 | 82
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 14 | 4
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] |  |
Estimated Fair Value - Less than 12 months | 86 | 36
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 | 3
Estimated Fair Value - 12 months or greater | 26 | 28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5 | 3
Estimated Fair Value | 112 | 64
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 9 | 6
Debt Security, Government, Non-US [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 2,469 | 973
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 50 | 27
Estimated Fair Value - 12 months or greater | 498 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 25 | 0
Estimated Fair Value | 2,967 | 973
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 75 | $ 27

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