Basis of Presentation, Uses of Estimates and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

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, 2014						December 31, 2013
(in millions)	Subsidies		Drug Discount		Risk-Share		Subsidies		Drug Discount		Risk-Share
Other current receivables	$	1,801	$	719	$	20	$	881	$	425	$	—
Other policy liabilities	—		302		—		—		152		214

Property, Plant and Equipment [Table Text Block]

A summary of property, equipment and capitalized software is as follows:

(in millions)	December 31, 2014			December 31, 2013
Land and improvements	$	310		$	318
Buildings and improvements	2,295			2,051
Computer equipment	1,693			1,519
Furniture and fixtures	675			564
Less accumulated depreciation	(1,982		)	(1,760		)
Property and equipment, net	2,991			2,692
Capitalized software	2,399			2,233
Less accumulated amortization	(972		)	(915		)
Capitalized software, net	1,427			1,318
Total property, equipment and capitalized software, net	$	4,418		$	4,010

Redeemable Noncontrolling Interest [Table Text Block]

The following table provides details of the Company's redeemable noncontrolling interests activity for the years ended December 31, 2014 and 2013:

(in millions)	2014		2013
Redeemable noncontrolling interests, beginning of period	$1,175		$2,121
Net earnings	—		48
Acquisitions	203		360
Redemptions	—		(1,417	)
Distributions	(40	)	—
Fair value and other adjustments	50		63
Redeemable noncontrolling interests, end of period	$1,388		$1,175

Useful Life [Member]

Property, Plant and Equipment [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