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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | $ 57,849 | $ 55,873
Financing Receivable, Allowance for Credit Loss | 42 | 31
Fixed maturity securities, available-for-sale | 57,922 | 60,749
Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | 57,849 | 55,873
Financing Receivable, Allowance for Credit Loss | 42 | 31
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2,181 | 5,256
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2,066 | 349
Fixed maturity securities, available-for-sale | $ 57,922 | $ 60,749
% of Total | 100.00% | 100.00%
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | $ 36,813 | $ 35,239
Fixed maturity securities, available-for-sale | $ 36,380 | $ 38,103
% of Total | 100.00% | 100.00%
Corporate Debt Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | $ 36,813 | $ 35,239
Financing Receivable, Allowance for Credit Loss | 33 | 26
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 954 | 3,084
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1,354 | 194
Fixed maturity securities, available-for-sale | $ 36,380 | $ 38,103
% of Total | 62.80% | 62.80%
Canadian and Canadian provincial governments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available-for-sale | $ 4,407 | $ 4,944
Canadian and Canadian provincial governments | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | 3,381 | 3,339
Financing Receivable, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,038 | 1,606
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 12 | 1
Fixed maturity securities, available-for-sale | $ 4,407 | $ 4,944
% of Total | 7.60% | 8.10%
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available-for-sale | $ 966 | $ 1,050
Residential mortgage-backed securities | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | 983 | 1,020
Financing Receivable, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 11 | 37
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 28 | 7
Fixed maturity securities, available-for-sale | $ 966 | $ 1,050
% of Total | 1.70% | 1.70%
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available-for-sale | $ 3,746 | $ 4,005
Asset-backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | 3,915 | 4,024
Financing Receivable, Allowance for Credit Loss | 5 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5 | 22
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 169 | 41
Fixed maturity securities, available-for-sale | $ 3,746 | $ 4,005
% of Total | 6.50% | 6.60%
Commercial Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available-for-sale | $ 1,786 | $ 1,849
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | 1,829 | 1,790
Financing Receivable, Allowance for Credit Loss | 1 | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6 | 66
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 48 | 6
Fixed maturity securities, available-for-sale | $ 1,786 | $ 1,849
% of Total | 3.10% | 3.00%
US Treasury and Government [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available-for-sale | $ 1,525 | $ 2,105
US Treasury and Government [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | 1,587 | 2,082
Financing Receivable, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 7 | 31
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 69 | 8
Fixed maturity securities, available-for-sale | $ 1,525 | $ 2,105
% of Total | 2.60% | 3.50%
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available-for-sale | $ 1,209 | $ 1,323
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | 1,206 | 1,191
Financing Receivable, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 50 | 137
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 47 | 5
Fixed maturity securities, available-for-sale | $ 1,209 | $ 1,323
% of Total | 2.10% | 2.20%
Debt Security, Government, Non-US [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available-for-sale | $ 7,903 | $ 7,370
Debt Security, Government, Non-US [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | 8,135 | 7,188
Financing Receivable, Allowance for Credit Loss | 3 | 4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 110 | 273
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 339 | 87
Fixed maturity securities, available-for-sale | $ 7,903 | $ 7,370
% of Total | 13.60% | 12.10%

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