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Significant Accounting Policies - 3R Program Receivables (Payables) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Accounting Policies [Abstract] |  |
Risk adjustment payable, Current Benefit Year | $ (912) |
Risk adjustment payable, Prior Benefit Years | 0 |
Risk adjustment payable, Total | (912) | $ (522)
Reinsurance receivable, Current Benefit Year | 0 |
Reinsurance receivable, Prior Benefit Years | 10 |
Reinsurance receivable, Total | 10 | 55
Risk corridor payable, Current Benefit Year | 0 |
Risk corridor payable, Prior Benefit Years | 0 |
Risk corridor payable, Total | 0 | (1)
Minimum MLR payable, Current Benefit Year | (2) |
Minimum MLR payable, Prior Benefit Years | 0 |
Minimum MLR payable, Total | $ (2) | $ (1)

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- Definition Affordable Care Act, Premium Stabilization Program, Minimum Medical Loss Ratio, Receivable (Payable) + References No definition available. + Details
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- Definition Affordable Care Act, Premium Stabilization Program, Minimum Medical Loss Ratio, Receivable (Payable), Current Year + References No definition available. + Details
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- Definition Affordable Care Act, Premium Stabilization Program, Minimum Medical Loss Ratio, Receivable (Payable), Prior Years + References No definition available. + Details
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