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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Financing Receivable, Allowance for Credit Loss | $ 22 | $ 20
Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 52,229 | 49,548
Financing Receivable, Allowance for Credit Loss | 22 | 20
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 4,709 | 7,404
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 490 | 197
Available-for-sale Securities | $ 56,426 | $ 56,735
% of Total | 100.00% | 100.00%
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 32,916 | $ 31,963
Available-for-sale Securities | $ 35,295 | $ 36,208
% of Total | 100.00% | 100.00%
Corporate Debt Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 32,916 | $ 31,963
Financing Receivable, Allowance for Credit Loss | 16 | 17
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,683 | 4,356
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 288 | 94
Available-for-sale Securities | $ 35,295 | $ 36,208
% of Total | 62.50% | 63.90%
Canadian and Canadian provincial governments | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 3,253 | $ 3,145
Financing Receivable, Allowance for Credit Loss | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,423 | 1,995
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 3 | 0
Available-for-sale Securities | $ 4,673 | $ 5,140
% of Total | 8.30% | 9.10%
Residential mortgage-backed securities | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,536 | $ 1,735
Financing Receivable, Allowance for Credit Loss | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 62 | 84
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 7 | 2
Available-for-sale Securities | $ 1,591 | $ 1,817
% of Total | 2.80% | 3.20%
Asset-backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 3,156 | $ 3,099
Financing Receivable, Allowance for Credit Loss | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 25 | 35
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 30 | 42
Available-for-sale Securities | $ 3,151 | $ 3,092
% of Total | 5.60% | 5.40%
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,774 | $ 1,790
Financing Receivable, Allowance for Credit Loss | 1 | 3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 78 | 102
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 11 | 21
Available-for-sale Securities | $ 1,840 | $ 1,868
% of Total | 3.30% | 3.30%
US Treasury and Government [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 960 | $ 1,242
Financing Receivable, Allowance for Credit Loss | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 23 | 196
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 53 | 1
Available-for-sale Securities | $ 930 | $ 1,437
% of Total | 1.60% | 2.50%
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,240 | $ 1,237
Financing Receivable, Allowance for Credit Loss | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 109 | 157
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 14 | 4
Available-for-sale Securities | $ 1,335 | $ 1,390
% of Total | 2.40% | 2.40%
Debt Security, Government, Non-US [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 7,394 | $ 5,337
Financing Receivable, Allowance for Credit Loss | 5 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 306 | 479
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 84 | 33
Available-for-sale Securities | $ 7,611 | $ 5,783
% of Total | 13.50% | 10.20%

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