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Affordable Care Act (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018
 
December 31, 2017
Risk adjustment
$
(928
)
 
$
(677
)
Reinsurance
1

 
15

Risk corridor
4

 
6

Minimum MLR
(265
)
 
(22
)
Cost sharing reductions
(50
)
 
(96
)