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Schedule V Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts and other      
Movement in Valuation allowance and reserves      
Balance January 1, $ 132 $ 137 $ 134
Increase (decrease) in Costs and Expenses   42 39
Write-offs/ Payments/ Other   (47) (36)
Balance December 31, 135 132 137
Allowance for uncollectible reinsurance      
Movement in Valuation allowance and reserves      
Balance January 1, 104 165 266
Increase (decrease) in Costs and Expenses 3 4 3
Write-offs/ Payments/ Other 19 (65) (104)
Balance December 31, 126 104 165
Valuation allowance on mortgage loans      
Movement in Valuation allowance and reserves      
Balance January 1, 1 0 4
Increase (decrease) in Costs and Expenses 0 1 0
Write-offs/ Payments/ Other 0 0 (4)
Balance December 31, 1 1 0
Valuation allowance for deferred taxes      
Movement in Valuation allowance and reserves      
Balance January 1, 0 0 79
Increase (decrease) in Costs and Expenses 0 0 (79)
Write-offs/ Payments/ Other 0 0 0
Balance December 31, $ 0 $ 0 $ 0