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Investments (Commercial Mortgage Loans By Year Of Origination) (Details) $ in Millions | Sep. 30, 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 | $ 1,803 |
Amount originated in prior year | 1,509 |
Amount originated 2 years prior | 3,302 |
Amount originated 3 years prior | 2,490 |
Amount originated 4 years prior | 1,894 |
Amount originated 5 or more years prior | 6,101 |
Total | 17,099 |
Commercial [Member] | Loan-to-value ratio, less than 65% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | 1,676 |
Amount originated in prior year | 1,365 |
Amount originated 2 years prior | 3,009 |
Amount originated 3 years prior | 2,298 |
Amount originated 4 years prior | 1,717 |
Amount originated 5 or more years prior | 5,869 |
Total | $ 15,934 |
Ratio of originations in current year | item | 3.07 |
Ratio of originations in prior year | item | 3.03 |
Ratio of originations 2 years prior | item | 2.19 |
Ratio of originations 3 years prior | item | 2.15 |
Ratio of originations 4 years prior | item | 2.32 |
Ratio of originations 5 or more years prior | item | 2.40 |
Commercial [Member] | Loan-to-value ratio, 65% to 74% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | $ 127 |
Amount originated in prior year | 144 |
Amount originated 2 years prior | 293 |
Amount originated 3 years prior | 177 |
Amount originated 4 years prior | 150 |
Amount originated 5 or more years prior | 195 |
Total | $ 1,086 |
Ratio of originations in current year | item | 1.76 |
Ratio of originations in prior year | item | 1.67 |
Ratio of originations 2 years prior | item | 1.62 |
Ratio of originations 3 years prior | item | 1.58 |
Ratio of originations 4 years prior | item | 1.74 |
Ratio of originations 5 or more years prior | item | 1.77 |
Commercial [Member] | Loan-to-value ratio, 75% to 100% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated 3 years prior | $ 15 |
Amount originated 4 years prior | 27 |
Amount originated 5 or more years prior | 37 |
Total | $ 79 |
Ratio of originations 3 years prior | item | 1.02 |
Ratio of originations 4 years prior | item | 0.96 |
Ratio of originations 5 or more years prior | item | 0.78 |

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