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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Financing Receivable, Allowance for Credit Loss | $ 33 |
Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 46,620 | $ 46,753
Financing Receivable, Allowance for Credit Loss | 33 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 3,429 | 4,478
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,461 | 110
Estimated Fair Value | $ 48,555 | $ 51,121
% of Total | 100.00% | 100.00%
Other-than-temporary impairments in AOCI |  | $ 0
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 29,203 | 29,205
Estimated Fair Value | $ 29,494 | $ 31,393
% of Total | 100.00% | 100.00%
Corporate Debt Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 29,203 | $ 29,205
Financing Receivable, Allowance for Credit Loss | 26 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,294 | 2,269
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 977 | 81
Estimated Fair Value | $ 29,494 | $ 31,393
% of Total | 60.80% | 61.40%
Other-than-temporary impairments in AOCI |  | $ 0
Canadian and Canadian provincial governments | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,793 | 3,016
Financing Receivable, Allowance for Credit Loss | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,445 | 1,596
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1 | 0
Estimated Fair Value | $ 4,237 | $ 4,612
% of Total | 8.70% | 9.00%
Other-than-temporary impairments in AOCI |  | $ 0
Residential mortgage-backed securities | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,241 | 2,339
Financing Receivable, Allowance for Credit Loss | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 77 | 62
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 27 | 3
Estimated Fair Value | $ 2,291 | $ 2,398
% of Total | 4.70% | 4.70%
Other-than-temporary impairments in AOCI |  | $ 0
Asset-backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,940 | 2,973
Financing Receivable, Allowance for Credit Loss | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 4 | 19
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 277 | 14
Estimated Fair Value | $ 2,667 | $ 2,978
% of Total | 5.50% | 5.80%
Other-than-temporary impairments in AOCI |  | $ 0
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,841 | 1,841
Financing Receivable, Allowance for Credit Loss | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 24 | 61
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 56 | 3
Estimated Fair Value | $ 1,809 | $ 1,899
% of Total | 3.70% | 3.70%
Other-than-temporary impairments in AOCI |  | $ 0
US Treasury and Government [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,398 | 2,096
Financing Receivable, Allowance for Credit Loss | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 244 | 57
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 1
Estimated Fair Value | $ 1,642 | $ 2,152
% of Total | 3.40% | 4.20%
Other-than-temporary impairments in AOCI |  | $ 0
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,071 | 1,074
Financing Receivable, Allowance for Credit Loss | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 108 | 93
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 10 | 3
Estimated Fair Value | $ 1,169 | $ 1,164
% of Total | 2.40% | 2.30%
Other-than-temporary impairments in AOCI |  | $ 0
Debt Security, Government, Non-US [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 5,133 | 4,209
Financing Receivable, Allowance for Credit Loss | 7 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 233 | 321
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 113 | 5
Estimated Fair Value | $ 5,246 | $ 4,525
% of Total | 10.80% | 8.90%
Other-than-temporary impairments in AOCI |  | $ 0

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