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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - Fixed maturity securities - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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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 | $ 6,175 | $ 3,979
Gross Unrealized Losses - Less than 12 months | 322 | 84
Estimated Fair Value - 12 months or greater | 738 | 1,238
Gross Unrealized Losses - 12 months or greater | 48 | 26
Estimated Fair Value | 6,913 | 5,217
Gross Unrealized Losses | 370 | 110
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 | 806 | 220
Gross Unrealized Losses - Less than 12 months | 120 | 38
Estimated Fair Value - 12 months or greater | 77 | 110
Gross Unrealized Losses - 12 months or greater | 14 | 8
Estimated Fair Value | 883 | 330
Gross Unrealized Losses | 134 | 46
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 | 5,369 | 3,759
Gross Unrealized Losses - Less than 12 months | 202 | 46
Estimated Fair Value - 12 months or greater | 661 | 1,128
Gross Unrealized Losses - 12 months or greater | 34 | 18
Estimated Fair Value | 6,030 | 4,887
Gross Unrealized Losses | 236 | 64
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 | 672 | 220
Gross Unrealized Losses - Less than 12 months | 94 | 38
Estimated Fair Value - 12 months or greater | 60 | 100
Gross Unrealized Losses - 12 months or greater | 9 | 7
Estimated Fair Value | 732 | 320
Gross Unrealized Losses | 103 | 45
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 | 2,446 | 1,936
Gross Unrealized Losses - Less than 12 months | 108 | 29
Estimated Fair Value - 12 months or greater | 83 | 293
Gross Unrealized Losses - 12 months or greater | 10 | 7
Estimated Fair Value | 2,529 | 2,229
Gross Unrealized Losses | 118 | 36
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 | 225 | 367
Gross Unrealized Losses - Less than 12 months | 1 | 2
Estimated Fair Value - 12 months or greater | 0 | 84
Gross Unrealized Losses - 12 months or greater | 0 | 1
Estimated Fair Value | 225 | 451
Gross Unrealized Losses | 1 | 3
Asset-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 | 19 | 0
Gross Unrealized Losses - Less than 12 months | 14 | 0
Estimated Fair Value - 12 months or greater | 4 | 0
Gross Unrealized Losses - 12 months or greater | 1 | 0
Estimated Fair Value | 23 | 0
Gross Unrealized Losses | 15 | 0
Asset-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 | 1,304 | 773
Gross Unrealized Losses - Less than 12 months | 37 | 5
Estimated Fair Value - 12 months or greater | 552 | 739
Gross Unrealized Losses - 12 months or greater | 20 | 9
Estimated Fair Value | 1,856 | 1,512
Gross Unrealized Losses | 57 | 14
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 | 22 | 0
Gross Unrealized Losses - Less than 12 months | 3 | 0
Estimated Fair Value - 12 months or greater | 0 | 0
Gross Unrealized Losses - 12 months or greater | 0 | 0
Estimated Fair Value | 22 | 0
Gross Unrealized Losses | 3 | 0
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 | 355 | 253
Gross Unrealized Losses - Less than 12 months | 19 | 3
Estimated Fair Value - 12 months or greater | 0 | 0
Gross Unrealized Losses - 12 months or greater | 0 | 0
Estimated Fair Value | 355 | 253
Gross Unrealized Losses | 19 | 3
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 | 0 | 49
Gross Unrealized Losses - Less than 12 months | 0 | 1
Estimated Fair Value - 12 months or greater | 0 | 0
Gross Unrealized Losses - 12 months or greater | 0 | 0
Estimated Fair Value | 0 | 49
Gross Unrealized Losses | 0 | 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 | 84 | 103
Gross Unrealized Losses - Less than 12 months | 2 | 2
Estimated Fair Value - 12 months or greater | 15 | 12
Gross Unrealized Losses - 12 months or greater | 2 | 1
Estimated Fair Value | 99 | 115
Gross Unrealized Losses | 4 | 3
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 | 93 | 0
Gross Unrealized Losses - Less than 12 months | 9 | 0
Estimated Fair Value - 12 months or greater | 13 | 10
Gross Unrealized Losses - 12 months or greater | 4 | 1
Estimated Fair Value | 106 | 10
Gross Unrealized Losses | 13 | 1
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 | 955 | 278
Gross Unrealized Losses - Less than 12 months | 35 | 4
Estimated Fair Value - 12 months or greater | 11 | 0
Gross Unrealized Losses - 12 months or greater | 2 | 0
Estimated Fair Value | 966 | 278
Gross Unrealized Losses | $ 37 | $ 4

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