v3.8.0.1
Affordable Care Act (Tables)
 12 Months Ended
Dec. 31, 2017
Affordable Care Act [Abstract]  
Schedule of receivables (payables) related to the Health Insurance Marketplace programs
The Company's receivables (payables) for each of these programs are as follows ($ in millions):
 
December 31, 2017
 
December 31, 2016
Risk adjustment
$
(677
)
 
$
(425
)
Reinsurance
15

 
122

Risk corridor
6

 
(3
)
Minimum MLR
(22
)
 
(18
)
Cost sharing reductions
(96
)
 
(147
)