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Investments (Investments in Fixed Maturity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 55 | $ 31
Fixed maturity securities, available-for-sale | 53,294 | 60,749
Available for Sale at Fair value - Amortized cost | 57,608 | $ 55,873
Funds Held Under Reinsurance Agreements Asset Specific Client | $ 4,100 |
Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
% of Total | 100.00% | 100.00%
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 55 | $ 31
Fixed maturity securities, available-for-sale | 53,294 | 60,749
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 870 | 5,256
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 5,129 | 349
Available for Sale at Fair value - Amortized cost | $ 57,608 | $ 55,873
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
% of Total | 100.00% | 100.00%
Fixed maturity securities, available-for-sale | $ 34,374 | $ 38,103
Available for Sale at Fair value - Amortized cost | $ 37,819 | $ 35,239
Corporate Debt Securities [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
% of Total | 64.50% | 62.80%
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 43 | $ 26
Fixed maturity securities, available-for-sale | 34,374 | 38,103
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 257 | 3,084
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 3,659 | 194
Available for Sale at Fair value - Amortized cost | 37,819 | 35,239
Canadian and Canadian provincial governments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available-for-sale | $ 3,809 | $ 4,944
Canadian and Canadian provincial governments | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
% of Total | 7.10% | 8.10%
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 0 | $ 0
Fixed maturity securities, available-for-sale | 3,809 | 4,944
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 536 | 1,606
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 35 | 1
Available for Sale at Fair value - Amortized cost | 3,308 | 3,339
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available-for-sale | $ 950 | $ 1,050
Residential mortgage-backed securities | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
% of Total | 1.80% | 1.70%
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 0 | $ 0
Fixed maturity securities, available-for-sale | 950 | 1,050
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 8 | 37
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 62 | 7
Available for Sale at Fair value - Amortized cost | 1,004 | 1,020
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available-for-sale | $ 3,782 | $ 4,005
Asset-backed securities | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
% of Total | 7.10% | 6.60%
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 5 | $ 0
Fixed maturity securities, available-for-sale | 3,782 | 4,005
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3 | 22
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 307 | 41
Available for Sale at Fair value - Amortized cost | 4,091 | 4,024
Commercial Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available-for-sale | $ 1,735 | $ 1,849
Commercial Mortgage Backed Securities [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
% of Total | 3.30% | 3.00%
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 1 | $ 1
Fixed maturity securities, available-for-sale | 1,735 | 1,849
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 | 66
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 122 | 6
Available for Sale at Fair value - Amortized cost | $ 1,856 | $ 1,790
US Treasury and Government [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
% of Total | 1.80% | 3.50%
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 0 | $ 0
Fixed maturity securities, available-for-sale | 962 | 2,105
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 7 | 31
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 146 | 8
Available for Sale at Fair value - Amortized cost | 1,101 | 2,082
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available-for-sale | $ 1,116 | $ 1,323
US States and Political Subdivisions Debt Securities [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
% of Total | 2.10% | 2.20%
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 0 | $ 0
Fixed maturity securities, available-for-sale | 1,116 | 1,323
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 21 | 137
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 107 | 5
Available for Sale at Fair value - Amortized cost | 1,202 | 1,191
Debt Security, Government, Non-US [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, available-for-sale | $ 6,566 | $ 7,370
Debt Security, Government, Non-US [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
% of Total | 12.30% | 12.10%
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 6 | $ 4
Fixed maturity securities, available-for-sale | 6,566 | 7,370
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 36 | 273
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 691 | 87
Available for Sale at Fair value - Amortized cost | $ 7,227 | $ 7,188

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