Fair Value (Tables)

9 Months Ended

Sep. 30, 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
September 30, 2013
Cash and cash equivalents	$	7,943		$	343		$	—		$	8,286
Debt securities - available-for-sale:
U.S. government and agency obligations	1,899			566			—			2,465
State and municipal obligations	—			6,750			—			6,750
Corporate obligations	31			7,576			27			7,634
U.S. agency mortgage-backed securities	—			2,020			—			2,020
Non-U.S. agency mortgage-backed securities	—			661			6			667
Total debt securities - available-for-sale	1,930			17,573			33			19,536
Equity securities - available-for-sale	536			26			246			808
Currency swap assets	—			22			—			22
Total assets at fair value	$	10,409		$	17,964		$	279		$	28,652
Percentage of total assets at fair value	36		%	63		%	1		%	100		%
Interest rate swap liabilities	$	—		$	79		$	—		$	79
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
September 30, 2013
Debt securities - held-to-maturity:
U.S. government and agency obligations	$	182	$	—	$	—	$	182	$	179
State and municipal obligations	—		—		28		28		28
Corporate obligations	47		341		277		665		665
Total debt securities - held-to-maturity	$	229	$	341	$	305	$	875	$	872
Long-term debt	$	—	$	16,604	$	—	$	16,604	$	15,723
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:

	Three Months Ended									Nine Months Ended
(in millions)	Debt Securities			Equity Securities			Total			Debt Securities			Equity Securities			Total
September 30, 2013
Balance at beginning of period	$	38		$	245		$	283		$	17		$	224		$	241
Purchases	3			9			12			25			51			76
Sales	(7		)	—			(7		)	(7		)	(21		)	(28		)
Net unrealized losses in accumulated other comprehensive income	—			(7		)	(7		)	(1		)	(13		)	(14		)
Net realized (losses) gains in investment and other income	(1		)	(1		)	(2		)	(1		)	5			4
Balance at end of period	$	33		$	246		$	279		$	33		$	246		$	279
September 30, 2012
Balance at beginning of period	$	7		$	228		$	235		$	208		$	209		$	417
Purchases	—			2			2			—			53			53
Sales	—			(11		)	(11		)	—			(20		)	(20		)
Settlements	(1		)	—			(1		)	(1		)	—			(1		)
Net unrealized losses in accumulated other comprehensive income	—			(9		)	(9		)	—			(12		)	(12		)
Net realized gains in investment and other income	—			8			8			—			9			9
Transfers to held-to-maturity	—			—			—			(201		)	(21		)	(222		)
Balance at end of period	$	6		$	218		$	224		$	6		$	218		$	224

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:

					Range
(in millions)	Fair Value		Valuation Technique	Unobservable Input	Low	High
September 30, 2013
Equity securities - available-for-sale
Venture capital portfolios	$	210	Market approach - comparable companies	Revenue multiple	1.0	10.0
				EBITDAmultiple	7.0	10.0
	36		Market approach - recent transactions	Inactive market transactions	N/A	N/A
Total equity securities      available-for-sale	$	246

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
September 30, 2013
Cash and cash equivalents	$	227	$	—	$	227
Debt securities:
U.S. government and agency obligations	487		271		758
State and municipal obligations	—		61		61
Corporate obligations	—		1,077		1,077
U.S. agency mortgage-backed securities	—		428		428
Non-U.S. agency mortgage-backed securities	—		139		139
Total debt securities	487		1,976		2,463
Equity securities - available-for-sale	—		4		4
Total assets at fair value	$	714	$	1,980	$	2,694
Other liabilities	$	8	$	18	$	26
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