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Medical Costs and Medical Costs Payable Medical Costs And Medical Costs Payable (Tables)
 12 Months Ended
Dec. 31, 2011
Medical Costs and Medical Costs Payable [Abstract]  
Medical Costs And Medical Costs Payable [Table Text Block]
The following table shows the components of the change in medical costs payable for the years ended December 31:
(in millions)
 
2011
 
2010
 
2009
Medical costs payable, beginning of period
 
$
9,220

 
$
9,362

 
$
8,664

Acquisitions
 
155

 
—

 
252

Reported medical costs:
 
 
 
 
 
 
Current year
 
75,052

 
69,641

 
65,599

Prior years
 
(720
)
 
(800
)
 
(310
)
Total reported medical costs
 
74,332

 
68,841

 
65,289

Claim payments:
 
 
 
 
 
 
Payments for current year
 
(65,763
)
 
(60,949
)
 
(57,109
)
Payments for prior year
 
(8,145
)
 
(8,034
)
 
(7,734
)
Total claim payments
 
(73,908
)
 
(68,983
)
 
(64,843
)
Medical costs payable, end of period
 
$
9,799

 
$
9,220

 
$
9,362