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Medical Cost Reserve Development and Medical Costs Payable (Tables)
 12 Months Ended
Dec. 31, 2014
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)
 
2014
 
2013
 
2012
Medical costs payable, beginning of period
 
$
11,575

 
$
11,004

 
$
9,799

Acquisitions
 
—

 
—

 
1,029

Reported medical costs:
 
 
 
 
 
 
Current year
 
93,677

 
89,970

 
81,086

Prior years
 
(420
)
 
(680
)
 
(860
)
Total reported medical costs
 
93,257

 
89,290

 
80,226

Claim payments:
 
 
 
 
 
 
Payments for current year
 
(82,374
)
 
(78,989
)
 
(71,832
)
Payments for prior year
 
(10,418
)
 
(9,730
)
 
(8,218
)
Total claim payments
 
(92,792
)
 
(88,719
)
 
(80,050
)
Medical costs payable, end of period
 
$
12,040

 
$
11,575

 
$
11,004