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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Financing Receivable, Allowance for Credit Loss | $ 31 | $ 20
Available for Sale at Fair value - Amortized cost | 55,873 | 49,548
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | $ 60,749 | $ 56,735
Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage Of Total Available For Sale Securities | 100.00% | 100.00%
Financing Receivable, Allowance for Credit Loss | $ 31 | $ 20
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 349 | 197
Available for Sale at Fair value - Amortized cost | 55,873 | 49,548
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | 60,749 | 56,735
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5,256 | 7,404
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | 35,239 | 31,963
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | $ 38,103 | $ 36,208
Corporate Debt Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage Of Total Available For Sale Securities | 62.80% | 63.90%
Financing Receivable, Allowance for Credit Loss | $ 26 | $ 17
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 194 | 94
Available for Sale at Fair value - Amortized cost | 35,239 | 31,963
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | 38,103 | 36,208
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3,084 | 4,356
Canadian Provincial Governments [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | $ 4,944 | $ 5,140
Canadian Provincial Governments [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage Of Total Available For Sale Securities | 8.10% | 9.10%
Financing Receivable, Allowance for Credit Loss | $ 0 | $ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1 | 0
Available for Sale at Fair value - Amortized cost | 3,339 | 3,145
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | 4,944 | 5,140
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,606 | 1,995
Residential Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | $ 1,050 | $ 1,817
Residential Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage Of Total Available For Sale Securities | 1.70% | 3.20%
Financing Receivable, Allowance for Credit Loss | $ 0 | $ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 7 | 2
Available for Sale at Fair value - Amortized cost | 1,020 | 1,735
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | 1,050 | 1,817
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 37 | 84
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | $ 4,005 | $ 3,092
Asset-backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage Of Total Available For Sale Securities | 6.60% | 5.40%
Financing Receivable, Allowance for Credit Loss | $ 0 | $ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 41 | 42
Available for Sale at Fair value - Amortized cost | 4,024 | 3,099
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | 4,005 | 3,092
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 22 | 35
Commercial Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | $ 1,849 | $ 1,868
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage Of Total Available For Sale Securities | 3.00% | 3.30%
Financing Receivable, Allowance for Credit Loss | $ 1 | $ 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 6 | 21
Available for Sale at Fair value - Amortized cost | 1,790 | 1,790
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | 1,849 | 1,868
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 66 | 102
US Treasury and Government [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | $ 2,105 | $ 1,437
US Treasury and Government [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage Of Total Available For Sale Securities | 3.50% | 2.50%
Financing Receivable, Allowance for Credit Loss | $ 0 | $ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 8 | 1
Available for Sale at Fair value - Amortized cost | 2,082 | 1,242
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | 2,105 | 1,437
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 31 | 196
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | $ 1,323 | $ 1,390
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage Of Total Available For Sale Securities | 2.20% | 2.40%
Financing Receivable, Allowance for Credit Loss | $ 0 | $ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 5 | 4
Available for Sale at Fair value - Amortized cost | 1,191 | 1,237
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | 1,323 | 1,390
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 137 | 157
Debt Security, Government, Non-US [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | $ 7,370 | $ 5,783
Debt Security, Government, Non-US [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage Of Total Available For Sale Securities | 12.10% | 10.20%
Financing Receivable, Allowance for Credit Loss | $ 4 | $ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 87 | 33
Available for Sale at Fair value - Amortized cost | 7,188 | 5,337
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) | 7,370 | 5,783
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | $ 273 | $ 479

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