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Reinsurance (Ceded Reinsurance Receivable Assets) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 2,595 | $ 2,580
Reinsurance Recoverables, Percentage of Total | 100.00% | 100.00%
Other Reinsurers [Member] | Customer Concentration Risk [Member] | Reinsurance Ceded Receivables Benchmark |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 176 | $ 174
Reinsurance Recoverables, Percentage of Total | 6.80% | 6.80%
AM Best, A+ Rating [Member] | Reinsurer B [Member] | Customer Concentration Risk [Member] | Reinsurance Ceded Receivables Benchmark |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 441 | $ 423
Reinsurance Recoverables, Percentage of Total | 17.00% | 16.40%
AM Best, A+ Rating [Member] | Reinsurer C [Member] | Customer Concentration Risk [Member] | Reinsurance Ceded Receivables Benchmark |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 216 | $ 212
Reinsurance Recoverables, Percentage of Total | 8.30% | 8.20%
AM Best, A+ Rating [Member] | Reinsurer E [Member] | Customer Concentration Risk [Member] | Reinsurance Ceded Receivables Benchmark |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 44 | $ 44
Reinsurance Recoverables, Percentage of Total | 1.70% | 1.70%
AM Best, A++ Rating [Member] | Reinsurer F | Customer Concentration Risk [Member] | Reinsurance Ceded Receivables Benchmark |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 42 | $ 42
Reinsurance Recoverables, Percentage of Total | 1.60% | 1.60%
AM Best, A Rating [Member] | Reinsurer D [Member] | Customer Concentration Risk [Member] | Reinsurance Ceded Receivables Benchmark |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 59 | $ 59
Reinsurance Recoverables, Percentage of Total | 2.30% | 2.30%
AM Best, A- Rating [Member] | Reinsurer A [Member] | Customer Concentration Risk [Member] | Reinsurance Ceded Receivables Benchmark |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 1,617 | $ 1,626
Reinsurance Recoverables, Percentage of Total | 62.30% | 63.00%

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