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Allowance for Expected Credit Losses (Details) - Changes in the Allowance for Estimated Uncollectible Reinsurance - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Reinsurance recoverables, allowance for uncollectible reinsurance    
Reinsurance recoverables (net of allowance for estimated uncollectible reinsurance), balance, beginning of period $ 8,152 $ 8,235
Reinsurance recoverables (net of allowance for estimated uncollectible reinsurance), balance, end of period 8,093 8,093
Reinsurance recoverables, allowance for uncollectible reinsurance [Roll Forward]    
Reinsurance recoverables, allowance for uncollectible reinsurance, beginning balance 149 92
Reinsurance recoverables, allowance for estimated uncollectible reinsurance 149 92
Current period change for estimated uncollectible reinsurance 7 11
Write-offs of uncollectible reinsurance recoverables 0 0
Reinsurance recoverables, allowance for uncollectible reinsurance, ending balance $ 156 156
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