Fair Value (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial Assets and Liabilities, Measured at Fair Value Recurring Basis [Table Text Block]

The following table presents a summary of fair value measurements by level and carrying values for items measured at fair value on a recurring basis in the Condensed Consolidated Balance Sheets excluding AARP Program-related assets and liabilities, which are presented in a separate table below:

(in millions)	Quoted Prices in Active Markets (Level 1)			Other Observable Inputs (Level 2)			Unobservable Inputs (Level 3)			Total Fair and Carrying Value
March 31, 2013
Cash and cash equivalents	$	9,301		$	737		$	—		$	10,038
Debt securities - available-for-sale:
U.S. government and agency obligations	1,748			723			—			2,471
State and municipal obligations	—			6,687			—			6,687
Corporate obligations	7			7,540			26			7,573
U.S. agency mortgage-backed securities	—			2,074			—			2,074
Non-U.S. agency mortgage-backed securities	—			653			6			659
Total debt securities - available-for-sale	1,755			17,677			32			19,464
Equity securities - available-for-sale	473			14			239			726
Interest rate swap assets	—			21			—			21
Total assets at fair value	$	11,529		$	18,449		$	271		$	30,249
Percentage of total assets at fair value	38		%	61		%	1		%	100		%
Interest rate and currency swap liabilities	$	—		$	11		$	—		$	11
December 31, 2012
Cash and cash equivalents	$	7,615		$	791		$	—		$	8,406
Debt securities - available-for-sale:
U.S. government and agency obligations	1,752			786			—			2,538
State and municipal obligations	—			6,667			—			6,667
Corporate obligations	13			7,185			11			7,209
U.S. agency mortgage-backed securities	—			2,238			—			2,238
Non-U.S. agency mortgage-backed securities	—			568			6			574
Total debt securities - available-for-sale	1,765			17,444			17			19,226
Equity securities - available-for-sale	450			3			224			677
Interest rate swap assets	—			14			—			14
Total assets at fair value	$	9,830		$	18,252		$	241		$	28,323
Percentage of total assets at fair value	35		%	64		%	1		%	100		%
Interest rate and currency swap liabilities	$	—		$	14		$	—		$	14

Fair Value Measurements, Nonrecurring [Table Text Block]

The following table presents a summary of fair value measurements by level and carrying values for certain financial instruments not measured at fair value on a recurring basis in the Condensed Consolidated Balance Sheets:

(in millions)	Quoted Prices in Active Markets (Level 1)		Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)		Total Fair Value		Total Carrying Value
March 31, 2013
Debt securities - held-to-maturity:
U.S. government and agency obligations	$	183	$	—	$	—	$	183	$	177
State and municipal obligations	—		—		28		28		28
Corporate obligations	16		345		261		622		622
Total debt securities - held-to-maturity	$	199	$	345	$	289	$	833	$	827
Long-term debt	$	—	$	17,967	$	—	$	17,967	$	16,330
December 31, 2012
Debt securities - held-to-maturity:
U.S. government and agency obligations	$	174	$	—	$	—	$	174	$	168
State and municipal obligations	—		1		29		30		30
Corporate obligations	10		346		287		643		641
Total debt securities - held-to-maturity	$	184	$	347	$	316	$	847	$	839
Long-term debt	$	—	$	17,034	$	—	$	17,034	$	15,167

Reconciliation of Assets Measured at Fair Value on a Recurring Basis Using Level 3 Inputs [Table Text Block]

A reconciliation of the beginning and ending balances of assets measured at fair value on a recurring basis using Level 3 inputs is as follows:

	March 31, 2013								March 31, 2012
(in millions)	Debt Securities		Equity Securities			Total			Debt Securities			Equity Securities			Total
Balance at beginning of period	$	17	$	224		$	241		$	208		$	209		$	417
Purchases	15		31			46			—			18			18
Sales	—		(21		)	(21		)	—			(2		)	(2		)
Net unrealized losses in accumulated other comprehensive income	—		(2		)	(2		)	—			—			—
Net realized gains in investment and other income	—		7			7			—			—			—
Transfers to held-to-maturity	—		—			—			(201		)	(21		)	(222		)
Balance at end of period	$	32	$	239		$	271		$	7		$	204		$	211

Fair Value Inputs, Assets, Quantitative Information [Table Text Block]

The following table presents quantitative information regarding unobservable inputs that were significant to the valuation of assets measured at fair value on a recurring basis using Level 3 inputs:

(in millions)	Fair Value		Valuation Technique	Unobservable Input	Low	High
March 31, 2013
Equity securities - available-for-sale
Venture capital portfolios	$	222	Market approach - comparable companies	Revenue multiple	1.0	10.0
				EBITDAmultiple	8.0	10.0
	17		Market approach - recent transactions	Inactive market transactions	N/A	N/A
Total equity securities      available-for-sale	$	239

Aarp Program [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial Assets and Liabilities, Measured at Fair Value Recurring Basis [Table Text Block]

(in millions)	Quoted Prices in Active Markets (Level 1)		Other Observable Inputs (Level 2)		Total Fair and Carrying Value
March 31, 2013
Cash and cash equivalents	$	57	$	—	$	57
Debt securities:
U.S. government and agency obligations	506		243		749
State and municipal obligations	—		57		57
Corporate obligations	—		1,200		1,200
U.S. agency mortgage-backed securities	—		446		446
Non-U.S. agency mortgage-backed securities	—		147		147
Total debt securities	506		2,093		2,599
Equity securities - available-for-sale	—		3		3
Total assets at fair value	$	563	$	2,096	$	2,659
Other liabilities	$	20	$	51	$	71
December 31, 2012
Cash and cash equivalents	$	230	$	—	$	230
Debt securities:
U.S. government and agency obligations	545		244		789
State and municipal obligations	—		51		51
Corporate obligations	—		1,118		1,118
U.S. agency mortgage-backed securities	—		427		427
Non-U.S. agency mortgage-backed securities	—		155		155
Total debt securities	545		1,995		2,540
Equity securities - available-for-sale	—		3		3
Total assets at fair value	$	775	$	1,998	$	2,773
Other liabilities	$	23	$	58	$	81