Quarterly report pursuant to Section 13 or 15(d)

Affordable Care Act (Details)

v3.8.0.1
Affordable Care Act (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Affordable Care Act [Abstract]    
Risk adjustment $ (1,131) $ (677)
Reinsurance 1 15
Risk corridor 5 6
Minimum MLR (44) (22)
Cost sharing reductions $ (71) $ (96)