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Medical Costs Payable (Tables)
 12 Months Ended
Dec. 31, 2015
Medical Reserve Development [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]
The following table shows the components of the change in medical costs payable for the years ended December 31:
(in millions)
 
2015
 
2014
 
2013
Medical costs payable, beginning of period
 
$
12,040

 
$
11,575

 
$
11,004

Reported medical costs:
 
 
 
 
 
 
Current year
 
104,195

 
94,053

 
90,339

Prior years
 
(320
)
 
(420
)
 
(680
)
Total reported medical costs
 
103,875

 
93,633

 
89,659

Claim payments:
 
 
 
 
 
 
Payments for current year
 
(90,630
)
 
(82,750
)
 
(79,358
)
Payments for prior year
 
(10,955
)
 
(10,418
)
 
(9,730
)
Total claim payments
 
(101,585
)
 
(93,168
)
 
(89,088
)
Medical costs payable, end of period
 
$
14,330

 
$
12,040

 
$
11,575