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Reinsurance (Ceded Reinsurance Receivable Assets) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 950 | $ 904
Reinsurance Recoverables, Percentage of Total | 100.00% | 100.00%
Other Reinsurers [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 178 | $ 149
Reinsurance Recoverables, Percentage of Total | 18.80% | 16.40%
AM Best, A+ Rating [Member] | Reinsurer A [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 403 | $ 367
Reinsurance Recoverables, Percentage of Total | 42.40% | 40.60%
AM Best, A+ Rating [Member] | Reinsurer B [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 207 | $ 208
Reinsurance Recoverables, Percentage of Total | 21.80% | 23.00%
AM Best, A+ Rating [Member] | Reinsurer E [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 46 | $ 43
Reinsurance Recoverables, Percentage of Total | 4.80% | 4.80%
AM Best, A Rating [Member] | Reinsurer C [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 63 | $ 84
Reinsurance Recoverables, Percentage of Total | 6.60% | 9.30%
AM Best, A++ Rating [Member] | Reinsurer D [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance ceded receivables | $ 53 | $ 53
Reinsurance Recoverables, Percentage of Total | 5.60% | 5.90%

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(6)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489 + Details
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