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Schedule V Valuation and Qualifying Accounts Level 4 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement in Valuation allowance and reserves      
Valuation allowance, deferred tax $ (79) $ (102) $ 5
Allowance for doubtful accounts and other [Member]      
Movement in Valuation allowance and reserves      
Balance January 1,   131 125
Charged to Costs and Expenses (39) (44) (50)
Write-offs/ Payments/ Other (36) (41) (44)
Balance December 31,     131
Allowance for Doubtful Accounts, Premiums and Other Receivables 137 134 131
Allowance for uncollectible reinsurance [Member]      
Movement in Valuation allowance and reserves      
Balance January 1, 266 271 244
Charged to Costs and Expenses (3) (12) (30)
Write-offs/ Payments/ Other (104) (17) (3)
Balance December 31, 165 266 271
Valuation allowance on mortgage loans [Member]      
Movement in Valuation allowance and reserves      
Balance January 1, 23 18 67
Charged to Costs and Expenses 0 (7) (4)
Write-offs/ Payments/ Other (4) (2) (53)
Balance December 31, 19 23 18
Valuation Allowance of Deferred Tax Assets [Member]      
Movement in Valuation allowance and reserves      
Balance January 1, 79 181 4
Valuation allowance, deferred tax   (102) 5
Write-offs/ Payments/ Other 0 0 (172)
Balance December 31, $ 0 $ 79 $ 181