Quarterly report pursuant to Section 13 or 15(d)

Affordable Care Act (Details)

v3.7.0.1
Affordable Care Act (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Affordable Care Act [Abstract]      
Risk adjustment and reinsurance, pre-tax benefit, period increase (decrease) $ 48 $ 70  
Risk adjustment (866)   $ (425)
Reinsurance 90   122
Risk corridor (7)   (3)
Minimum MLR (27)   (18)
Cost sharing reductions $ (280)   $ (147)