XML 70 R56.htm IDEA: XBRL DOCUMENT v3.5.0.2
Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Components of medical care costs related to:    
Medical claims and benefits payable, beginning balance $ 1,685 $ 1,201
Current period 11,120 11,935
Prior periods (190) (141)
Total medical care costs 10,930 11,794
Change in non-risk provider payables 70 48
Payments for medical care costs related to:    
Current period 9,536 10,448
Prior periods 1,278 910
Total paid 10,814 11,358
Medical claims and benefits payable, ending balance $ 1,871 $ 1,685
Benefit from prior period as a percentage of:    
Balance at beginning of period 11.30% 11.80%
Premium revenue, trailing twelve months 1.20% 1.10%
Medical care costs, trailing twelve months 1.30% 1.20%