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Affordable Care Act (Tables) | 12 Months Ended
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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 | )

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