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Investments (Commercial Mortgage Loans By Year Of Origination) (Details) $ in Millions | Mar. 31, 2022 USD ($) item | Dec. 31, 2021 USD ($) item
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year |  | $ 2,520
Amount originated in prior year |  | 1,502
Amount originated 2 years prior |  | 3,105
Amount originated 3 years prior |  | 2,461
Amount originated 4 years prior |  | 1,831
Amount originated 5 or more years prior |  | 5,752
Total |  | 17,171
Loan-to-value ratio, less than 65% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year |  | 2,384
Amount originated in prior year |  | 1,358
Amount originated 2 years prior |  | 2,917
Amount originated 3 years prior |  | 2,274
Amount originated 4 years prior |  | 1,655
Amount originated 5 or more years prior |  | 5,554
Total |  | $ 16,142
Ratio of originations in current year | item |  | 3.04
Ratio of originations in prior year | item |  | 3.03
Ratio of originations 2 years prior | item |  | 2.15
Ratio of originations 3 years prior | item |  | 2.13
Ratio of originations 4 years prior | item |  | 2.33
Ratio of originations 5 or more years prior | item |  | 2.41
Loan-to-value ratio, 65% to 74% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year |  | $ 136
Amount originated in prior year |  | 144
Amount originated 2 years prior |  | 188
Amount originated 3 years prior |  | 172
Amount originated 4 years prior |  | 149
Amount originated 5 or more years prior |  | 171
Total |  | $ 960
Ratio of originations in current year | item |  | 1.74
Ratio of originations in prior year | item |  | 2.06
Ratio of originations 2 years prior | item |  | 1.42
Ratio of originations 3 years prior | item |  | 1.59
Ratio of originations 4 years prior | item |  | 1.74
Ratio of originations 5 or more years prior | item |  | 1.76
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 |  | 27
Total |  | $ 69
Ratio of originations 3 years prior | item |  | 1.02
Ratio of originations 4 years prior | item |  | 0.83
Ratio of originations 5 or more years prior | item |  | 1.08
Commercial [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | $ 354 |
Amount originated in prior year | 2,465 |
Amount originated 2 years prior | 1,375 |
Amount originated 3 years prior | 2,878 |
Amount originated 4 years prior | 2,408 |
Amount originated 5 or more years prior | 7,390 |
Total | 16,870 |
Commercial [Member] | Loan-to-value ratio, less than 65% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | 329 |
Amount originated in prior year | 2,378 |
Amount originated 2 years prior | 1,355 |
Amount originated 3 years prior | 2,700 |
Amount originated 4 years prior | 2,238 |
Amount originated 5 or more years prior | 7,040 |
Total | $ 16,040 |
Ratio of originations in current year | item | 2.67 |
Ratio of originations in prior year | item | 3.05 |
Ratio of originations 2 years prior | item | 2.98 |
Ratio of originations 3 years prior | item | 2.15 |
Ratio of originations 4 years prior | item | 2.14 |
Ratio of originations 5 or more years prior | item | 2.37 |
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 | 87 |
Amount originated 2 years prior | 20 |
Amount originated 3 years prior | 178 |
Amount originated 4 years prior | 155 |
Amount originated 5 or more years prior | 302 |
Total | $ 767 |
Ratio of originations in current year | item | 1.57 |
Ratio of originations in prior year | item | 1.50 |
Ratio of originations 2 years prior | item | 1.55 |
Ratio of originations 3 years prior | item | 1.56 |
Ratio of originations 4 years prior | item | 1.56 |
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 4 years prior | $ 15 |
Amount originated 5 or more years prior | 48 |
Total | $ 63 |
Ratio of originations 4 years prior | item | 1.02 |
Ratio of originations 5 or more years prior | item | 0.99 |

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