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Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance, beginning of period $ 650 $ 645 $ 636
Deferred costs 1,404 1,377 1,378
Amortization — DAC (1,384) (1,372) (1,377)
Add: Maxum acquisition 0 0 8
Balance, end of period $ 670 $ 650 $ 645