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Reinsurance (Ceded Reinsurance Receivable Assets) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables and other | $ 2,456 | $ 2,580
Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables and other | $ 2,456 | $ 2,580
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 and other | $ 122 | $ 174
Reinsurer Concentration Risk | 5.10% | 6.80%
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 and other | $ 1,607 | $ 1,626
Reinsurer Concentration Risk | 65.40% | 63.00%
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 and other | $ 406 | $ 423
Reinsurer Concentration Risk | 16.50% | 16.40%
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 and other | $ 194 | $ 212
Reinsurer Concentration Risk | 7.90% | 8.20%
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 and other | $ 40 | $ 44
Reinsurer Concentration Risk | 1.60% | 1.70%
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 and other | $ 54 | $ 59
Reinsurer Concentration Risk | 2.20% | 2.30%
AM Best, A++ Rating [Member] | Reinsurer F | Reinsurer Concentration Risk | Reinsurance Recoverable Including Reinsurance Premium Paid |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables and other | $ 33 | $ 42
Reinsurer Concentration Risk | 1.30% | 1.60%

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