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Health Care Costs Payable (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($)
Health care costs payable, beginning of the period | $ 6,147
Reinsurance recoverables | 4
Health care costs payable, beginning of the period, net | 6,143
Add Components Of Incurred Health Care Costs [Abstract] |
Current year incurred health care costs | 13,804
Prior year incurred health care costs | (446)
Policyholder Benefits and Claims Incurred, Net, Health | 13,358
Less Claims Paid [Abstract] |
Current year claims paid | 8,004
Prior year claims paid | 4,812
Total claims paid | 12,816
Premium Deficiency Reserves | 11
Health care costs payable, end of the period, net | 6,696
Reinsurance recoverables | 5
Health care costs payable, end of the period | 6,701
Incurred but Not Reported (IBNR) Claims Liability, Net | 5,100
Health Care Benefits Segment [Member] |
Less Claims Paid [Abstract] |
Benefit costs recorded in other insurance liabilities | 10
Corporate / Other [Member] |
Less Claims Paid [Abstract] |
Benefit costs recorded in other insurance liabilities | $ 80

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