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Consolidated Supplementary Insurance Information (Balance Sheet Items) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplementary Insurance Information, by Segment [Line Items]      
DAC and VOBA $ 5,623 $ 6,339 $ 5,777
Future Policy Benefits and Other Policy-Related Balances 38,435 35,464  
Policyholder account balances 37,069 36,579  
Unearned Premiums 18 19  
Unearned Revenue 216 218  
Annuities      
Supplementary Insurance Information, by Segment [Line Items]      
DAC and VOBA 4,819 4,820  
Future Policy Benefits and Other Policy-Related Balances 8,200 7,560  
Policyholder account balances 25,943 25,233  
Unearned Premiums 0 0  
Unearned Revenue 93 86  
Life      
Supplementary Insurance Information, by Segment [Line Items]      
DAC and VOBA 671 787  
Future Policy Benefits and Other Policy-Related Balances 4,437 4,094  
Policyholder account balances 2,620 2,838  
Unearned Premiums 13 13  
Unearned Revenue 28 53  
Run-off      
Supplementary Insurance Information, by Segment [Line Items]      
DAC and VOBA 5 584  
Future Policy Benefits and Other Policy-Related Balances 18,265 16,381  
Policyholder account balances 8,505 8,506  
Unearned Premiums 0 0  
Unearned Revenue 95 79  
Corporate & Other      
Supplementary Insurance Information, by Segment [Line Items]      
DAC and VOBA 128 148  
Future Policy Benefits and Other Policy-Related Balances 7,533 7,429  
Policyholder account balances 1 2  
Unearned Premiums 5 6  
Unearned Revenue $ 0 $ 0