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Allowance for Expected Credit Losses (Details) - Changes in the Allowance for Estimated Uncollectible Reinsurance
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Reinsurance recoverables, allowance for uncollectible reinsurance  
Reinsurance recoverables (net of allowance for estimated uncollectible reinsurance), balance, beginning of year $ 8,235
Reinsurance recoverables (net of allowance for estimated uncollectible reinsurance), balance, end of period 8,152
Reinsurance recoverables, allowance for uncollectible reinsurance [Roll Forward]  
Reinsurance recoverables, allowance for uncollectible reinsurance, beginning balance 92
Reinsurance recoverables, allowance for estimated uncollectible reinsurance 149
Current period change for estimated uncollectible reinsurance 4
Write-offs of uncollectible reinsurance recoverables 0
Reinsurance recoverables, allowance for uncollectible reinsurance, ending balance 149
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]  
Reinsurance recoverables, allowance for uncollectible reinsurance [Roll Forward]  
Reinsurance recoverables, allowance for uncollectible reinsurance, beginning balance 53
Reinsurance recoverables, allowance for estimated uncollectible reinsurance $ 53