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Significant Accounting Policies - Consolidated Medical Care Costs (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Medical Care Costs |  |  |
Fee-for-service | $ 10,993,000,000 | $ 8,572,000,000 | $ 5,673,000,000
Pharmacy | 2,213,000,000 | 1,610,000,000 | 1,273,000,000
Capitation | 1,218,000,000 | 982,000,000 | 748,000,000
Direct delivery | 78,000,000 | 128,000,000 | 96,000,000
Other | 272,000,000 | 502,000,000 | 286,000,000
Total | 14,774,000,000 | 11,794,000,000 | 8,076,000,000
Medical Care Costs, PMPM |  |  |
Fee-for-service (per member per month) | 217.84 | 218.35 | 202.87
Pharmacy (per member per month) | 43.84 | 41.01 | 45.54
Capitation (per member per month) | 24.13 | 25.02 | 26.77
Direct delivery (per member per month) | 1.55 | 3.26 | 3.44
Other (per member per month) | 5.39 | 12.79 | 10.22
Total (per member per month) | $ 292.75 | $ 300.43 | $ 288.84
Medical Care Costs, Percentage |  |  |
Percentage of total in Fee for service | 74.40% | 72.70% | 70.20%
Percentage of total in pharmacy | 15.00% | 13.70% | 15.80%
Percentage of total in capitation | 8.20% | 8.30% | 9.30%
Percent of total in direct delivery | 0.50% | 1.10% | 1.20%
Percentage of total in other | 1.90% | 4.20% | 3.50%
Percentage of total | 100.00% | 100.00% | 100.00%

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