Basis of Presentation Basis of Presentation (Tables)

12 Months Ended

Dec. 31, 2011

Accounting Policies [Abstract]

Schedule of Other Current Receivables and Other Policy Liabilities Associated with Medicare Part D Program [Table Text Block]

The Consolidated Balance Sheets include the following amounts associated with the Medicare Part D program:

	December 31, 2011						December 31, 2010
(in millions)	Subsidies		Drug Discount		Risk-Share		Subsidies		Risk-Share
Other current receivables	$	—	$	509	$	—	$	—	$	—
Other policy liabilities	70		649		170		475		265

Useful lives for property, equipment and capitalized software [Table Text Block]

The Company calculates depreciation and amortization using the straight-line method over the estimated useful lives of the assets. The useful lives for property, equipment and capitalized software are:

Furniture, fixtures and equipment	3 to 7 years
Buildings	35 to 40 years
Leasehold improvements	7 years or length of lease term, whichever is shorter
Capitalized software	3 to 5 years