Fair Value (Tables)

12 Months Ended

Dec. 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 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
December 31, 2013
Cash and cash equivalents	$	7,005		$	271		$	—		$	7,276
Debt securities - available-for-sale:
U.S. government and agency obligations	1,750			445			—			2,195
State and municipal obligations	—			6,977			—			6,977
Corporate obligations	25			7,274			36			7,335
U.S. agency mortgage-backed securities	—			2,218			—			2,218
Non-U.S. agency mortgage-backed securities	—			696			6			702
Total debt securities - available-for-sale	1,775			17,610			42			19,427
Equity securities - available-for-sale	1,291			12			269			1,572
Total assets at fair value	$	10,071		$	17,893		$	311		$	28,275
Percentage of total assets at fair value	36		%	63		%	1		%	100		%
Interest rate swap liabilities	$	—		$	163		$	—		$	163
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 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
December 31, 2013
Debt securities - held-to-maturity:
U.S. government and agency obligations	$	182	$	—	$	—	$	182	$	181
State and municipal obligations	—		—		28		28		28
Corporate obligations	47		9		278		334		334
Total debt securities - held-to-maturity	$	229	$	9	$	306	$	544	$	543
Long-term debt and other financing obligations	$	—	$	16,602	$	—	$	16,602	$	15,745
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:

	December 31, 2013									December 31, 2012									December 31, 2011
(in millions)	Debt Securities			Equity Securities			Total			Debt Securities			Equity Securities			Total			Debt Securities			Equity Securities			Total
Balance at beginning of period	$	17		$	224		$	241		$	208		$	209		$	417		$	141		$	208		$	349
Purchases	38			71			109			11			71			82			92			35			127
Sales	(10		)	(25		)	(35		)	—			(34		)	(34		)	—			(17		)	(17		)
Settlements	—			—			—			(1		)	—			(1		)	(25		)	(7		)	(32		)
Net unrealized losses in accumulated other comprehensive income	(2		)	(7		)	(9		)	—			(14		)	(14		)	—			(4		)	(4		)
Net realized (losses) gains in investment and other income	(1		)	6			5			—			13			13			—			(6		)	(6		)
Transfers to held-to-maturity	—			—			—			(201		)	(21		)	(222		)	—			—			—
Balance at end of period	$	42		$	269		$	311		$	17		$	224		$	241		$	208		$	209		$	417

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
December 31, 2013
Equity securities - available-for-sale
Venture capital portfolios	$	233	Market approach - comparable companies	Revenue multiple	1.0	6.0
				EBITDAmultiple	8.0	9.0
	36		Market approach - recent transactions	Inactive market transactions	N/A	N/A
Total equity securities      available-for-sale	$	269

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
December 31, 2013
Cash and cash equivalents	$	265	$	—	$	265
Debt securities:
U.S. government and agency obligations	426		301		727
State and municipal obligations	—		63		63
Corporate obligations	—		1,145		1,145
U.S. agency mortgage-backed securities	—		414		414
Non-U.S. agency mortgage-backed securities	—		139		139
Total debt securities	426		2,062		2,488
Equity securities - available-for-sale	—		4		4
Total assets at fair value	$	691	$	2,066	$	2,757
Other liabilities	$	3	$	11	$	14
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