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Investments (Investments in Fixed Maturity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Financing Receivable, Allowance for Credit Loss | $ 19 |
Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 48,661 | $ 46,753
Financing Receivable, Allowance for Credit Loss | 19 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 6,380 | 4,478
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 370 | 110
Estimated Fair Value | $ 54,652 | $ 51,121
% of Total | 100.00% | 100.00%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 31,044 | 29,205
Estimated Fair Value | $ 34,259 | $ 31,393
% of Total | 100.00% | 100.00%
Corporate Debt Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 31,044 | $ 29,205
Financing Receivable, Allowance for Credit Loss | 19 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 3,455 | 2,269
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 221 | 81
Estimated Fair Value | $ 34,259 | $ 31,393
% of Total | 62.70% | 61.40%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Canadian and Canadian provincial governments | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,985 | 3,016
Financing Receivable, Allowance for Credit Loss | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,912 | 1,596
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Estimated Fair Value | $ 4,897 | $ 4,612
% of Total | 9.00% | 9.00%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Residential mortgage-backed securities | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,927 | 2,339
Financing Receivable, Allowance for Credit Loss | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 101 | 62
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1 | 3
Estimated Fair Value | $ 2,027 | $ 2,398
% of Total | 3.70% | 4.70%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Asset-backed securities | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,966 | 2,973
Financing Receivable, Allowance for Credit Loss | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 28 | 19
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 72 | 14
Estimated Fair Value | $ 2,922 | $ 2,978
% of Total | 5.30% | 5.80%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,871 | 1,841
Financing Receivable, Allowance for Credit Loss | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 81 | 61
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 22 | 3
Estimated Fair Value | $ 1,930 | $ 1,899
% of Total | 3.50% | 3.70%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
US Treasury and Government [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,392 | 2,096
Financing Receivable, Allowance for Credit Loss | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 238 | 57
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 1
Estimated Fair Value | $ 1,630 | $ 2,152
% of Total | 3.00% | 4.20%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,233 | 1,074
Financing Receivable, Allowance for Credit Loss | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 154 | 93
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 4 | 3
Estimated Fair Value | $ 1,383 | $ 1,164
% of Total | 2.50% | 2.30%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Debt Security, Government, Non-US [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,243 | 4,209
Financing Receivable, Allowance for Credit Loss | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 411 | 321
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 50 | 5
Estimated Fair Value | $ 5,604 | $ 4,525
% of Total | 10.30% | 8.90%
Other-than-temporary impairments in AOCI | $ 0 | $ 0

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