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Reinsurance (Ceded Reinsurance Receivable Assets) (Details) - USD ($) $ in Millions | 6 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Ceded Credit Risk [Line Items] |  |  |
Reinsurance ceded receivables | $ 1,093 |  | $ 983
Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance ceded receivables | $ 1,093 |  | 983
Reinsurer Concentration Risk | 100.00% | 100.00% |
Other Reinsurers [Member] | Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance ceded receivables | $ 209 |  | 182
Reinsurer Concentration Risk | 19.20% | 18.50% |
AM Best, A+ Rating [Member] | Reinsurer A [Member] | Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance ceded receivables | $ 476 |  | 420
Reinsurer Concentration Risk | 43.50% | 42.70% |
AM Best, A+ Rating [Member] | Reinsurer B [Member] | Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance ceded receivables | $ 225 |  | 216
Reinsurer Concentration Risk | 20.60% | 22.00% |
AM Best, A+ Rating [Member] | Reinsurer E [Member] | Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance ceded receivables | $ 50 |  | 46
Reinsurer Concentration Risk | 4.60% | 4.70% |
AM Best, A Rating [Member] | Reinsurer C [Member] | Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance ceded receivables | $ 67 |  | 64
Reinsurer Concentration Risk | 6.10% | 6.50% |
AM Best, A++ Rating [Member] | Reinsurer D [Member] | Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance ceded receivables | $ 66 |  | $ 55
Reinsurer Concentration Risk | 6.00% | 5.60% |

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