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Investments (Commercial Mortgage Loans By Year Of Origination) (Details) $ in Millions | Mar. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) item
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year |  | $ 1,536
Amount originated in prior year |  | 3,401
Amount originated 2 years prior |  | 2,583
Amount originated 3 years prior |  | 1,955
Amount originated 4 years prior |  | 1,909
Amount originated 5 or more years prior |  | 4,851
Total |  | 16,235
Loan-to-value ratio, less than 65% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year |  | 1,504
Amount originated in prior year |  | 3,141
Amount originated 2 years prior |  | 2,382
Amount originated 3 years prior |  | 1,786
Amount originated 4 years prior |  | 1,713
Amount originated 5 or more years prior |  | 4,710
Total |  | $ 15,236
Ratio of originations in current year | item |  | 2.86
Ratio of originations in prior year | item |  | 2.25
Ratio of originations 2 years prior | item |  | 2.16
Ratio of originations 3 years prior | item |  | 2.34
Ratio of originations 4 years prior | item |  | 2.37
Ratio of originations 5 or more years prior | item |  | 2.38
Loan-to-value ratio, 65% to 74% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year |  | $ 32
Amount originated in prior year |  | 258
Amount originated 2 years prior |  | 186
Amount originated 3 years prior |  | 169
Amount originated 4 years prior |  | 174
Amount originated 5 or more years prior |  | 133
Total |  | $ 952
Ratio of originations in current year | item |  | 1.52
Ratio of originations in prior year | item |  | 1.78
Ratio of originations 2 years prior | item |  | 1.49
Ratio of originations 3 years prior | item |  | 1.73
Ratio of originations 4 years prior | item |  | 1.56
Ratio of originations 5 or more years prior | item |  | 1.95
Loan-to-value ratio, 75% to 100% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in prior year |  | $ 2
Amount originated 2 years prior |  | 15
Amount originated 4 years prior |  | 22
Amount originated 5 or more years prior |  | 8
Total |  | $ 47
Ratio of originations in prior year | item |  | 1.74
Ratio of originations 2 years prior | item |  | 0.71
Ratio of originations 4 years prior | item |  | 1.58
Ratio of originations 5 or more years prior | item |  | 1.02
Commercial [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | $ 704 |
Amount originated in prior year | 1,520 |
Amount originated 2 years prior | 3,393 |
Amount originated 3 years prior | 2,571 |
Amount originated 4 years prior | 1,933 |
Amount originated 5 or more years prior | 6,546 |
Total | 16,667 |
Commercial [Member] | Loan-to-value ratio, less than 65% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | 679 |
Amount originated in prior year | 1,371 |
Amount originated 2 years prior | 3,050 |
Amount originated 3 years prior | 2,338 |
Amount originated 4 years prior | 1,753 |
Amount originated 5 or more years prior | 6,253 |
Total | $ 15,444 |
Ratio of originations in current year | item | 2.99 |
Ratio of originations in prior year | item | 3.02 |
Ratio of originations 2 years prior | item | 2.21 |
Ratio of originations 3 years prior | item | 2.15 |
Ratio of originations 4 years prior | item | 2.34 |
Ratio of originations 5 or more years prior | item | 2.39 |
Commercial [Member] | Loan-to-value ratio, 65% to 74% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | $ 25 |
Amount originated in prior year | 109 |
Amount originated 2 years prior | 318 |
Amount originated 3 years prior | 218 |
Amount originated 4 years prior | 153 |
Amount originated 5 or more years prior | 263 |
Total | $ 1,086 |
Ratio of originations in current year | item | 1.95 |
Ratio of originations in prior year | item | 1.47 |
Ratio of originations 2 years prior | item | 1.96 |
Ratio of originations 3 years prior | item | 1.55 |
Ratio of originations 4 years prior | item | 1.74 |
Ratio of originations 5 or more years prior | item | 1.75 |
Commercial [Member] | Loan-to-value ratio, 75% to 100% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in prior year | $ 40 |
Amount originated 2 years prior | 25 |
Amount originated 3 years prior | 15 |
Amount originated 4 years prior | 27 |
Amount originated 5 or more years prior | 30 |
Total | $ 137 |
Ratio of originations in prior year | item | 2.21 |
Ratio of originations 2 years prior | item | 1.79 |
Ratio of originations 3 years prior | item | 0.76 |
Ratio of originations 4 years prior | item | 0.67 |
Ratio of originations 5 or more years prior | item | 1.40 |

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