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Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance, beginning of period $ 645 $ 636 $ 623
Deferred costs 1,377 1,378 1,377
Amortization — DAC (1,372) (1,377) (1,364)
Add: Maxum acquisition 0 8 0
Balance, end of period $ 650 $ 645 $ 636