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Affordable Care Act (Tables)
 9 Months Ended
Sep. 30, 2021
Affordable Care Act [Abstract]  
Schedule of net receivables (payables) related to the Affordable Care Act Programs
The Company's net receivables (payables) for each of the programs are as follows ($ in millions):
September 30, 2021December 31, 2020
Risk adjustment receivable$463 $340 
Risk adjustment payable(472)(1,224)
Minimum medical loss ratio(65)(238)
Cost sharing reduction receivable92 101 
Cost sharing reduction payable(12)(1)