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Investments (Commercial Mortgage Loans By Year Of Origination) (Details) - Commercial [Member] | Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) item
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | $ 2,520,000,000 | $ 1,536,000,000
Amount originated in prior year | 1,502,000,000 | 3,401,000,000
Amount originated 2 years prior | 3,105,000,000 | 2,583,000,000
Amount originated 3 years prior | 2,461,000,000 | 1,955,000,000
Amount originated 4 years prior | 1,831,000,000 | 1,909,000,000
Amount originated 5 or more years prior | 5,752,000,000 | 4,851,000,000
Total | 17,171,000,000 | 16,235,000,000
Loan-to-value ratio, less than 65% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | 2,384,000,000 | 1,504,000,000
Amount originated in prior year | 1,358,000,000 | 3,141,000,000
Amount originated 2 years prior | 2,917,000,000 | 2,382,000,000
Amount originated 3 years prior | 2,274,000,000 | 1,786,000,000
Amount originated 4 years prior | 1,655,000,000 | 1,713,000,000
Amount originated 5 or more years prior | 5,554,000,000 | 4,710,000,000
Total | $ 16,142,000,000 | $ 15,236,000,000
Ratio of originations in current year | item | 3.04 | 2.86
Ratio of originations in prior year | item | 3.03 | 2.25
Ratio of originations 2 years prior | item | 2.15 | 2.16
Ratio of originations 3 years prior | item | 2.13 | 2.34
Ratio of originations 4 years prior | item | 2.33 | 2.37
Ratio of originations 5 or more years prior | item | 2.41 | 2.38
Loan-to-value ratio, 65% to 74% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | $ 136,000,000 | $ 32,000,000
Amount originated in prior year | 144,000,000 | 258,000,000
Amount originated 2 years prior | 188,000,000 | 186,000,000
Amount originated 3 years prior | 172,000,000 | 169,000,000
Amount originated 4 years prior | 149,000,000 | 174,000,000
Amount originated 5 or more years prior | 171,000,000 | 133,000,000
Total | $ 960,000,000 | $ 952,000,000
Ratio of originations in current year | item | 1.74 | 1.52
Ratio of originations in prior year | item | 2.06 | 1.78
Ratio of originations 2 years prior | item | 1.42 | 1.49
Ratio of originations 3 years prior | item | 1.59 | 1.73
Ratio of originations 4 years prior | item | 1.74 | 1.56
Ratio of originations 5 or more years prior | item | 1.76 | 1.95
Loan-to-value ratio, 75% to 100% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in prior year |  | $ 2,000,000
Amount originated 2 years prior |  | 15,000,000
Amount originated 3 years prior | $ 15,000,000 |
Amount originated 4 years prior | 27,000,000 | 22,000,000
Amount originated 5 or more years prior | 27,000,000 | 8,000,000
Total | $ 69,000,000 | $ 47,000,000
Ratio of originations in prior year | item |  | 1.74
Ratio of originations 2 years prior | item |  | 0.71
Ratio of originations 3 years prior | item | 1.02 |
Ratio of originations 4 years prior | item | 0.83 | 1.58
Ratio of originations 5 or more years prior | item | 1.08 | 1.02

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