Fair Value Measurements Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2013
ERROR in label resolution.
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount								$ 450
Gain (Loss) on Interest Rate Fair Value Hedge Ineffectiveness						$ 8
ERROR in label resolution. | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ (22)	$ 13			$ (180)	81
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	27	54			107	156
ERROR in label resolution. | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net						11
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net						2
ERROR in label resolution.
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in earnings for terminated interest rate swaps				$ 35
Accrued Investment Income Receivable				$ 7
Derivative, Notional Amount	2,403				2,403		$ 1,458
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	27	54			107	156
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	29				29
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance	(38)				(38)		145
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	2,296				2,296		2,090
Unamortized gains on senior notes	54				54		63
Unrealized gain on interest rate cash flow hedges, pretax, AOCI	9				9		10
reduction of interest expense, related to amortization of previously terminated interest rate contracts	3	3			10	10
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	13				13
Derivative Assets	94				94		237
Derivative Liabilities	177				177		23
Time Deposits, at Carrying Value	19				19		31
Cash	191				191		170
Impairment of Intangible Assets (Excluding Goodwill)	7	10	$ 9		7	19
Cost-method Investments, Aggregate Carrying Amount	20				20		45
Debt Instrument, Fair Value Disclosure	5,892				5,892		5,887
Loss on hedged debt obligation [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense, Other						8
Fair Value, Measurements, Recurring [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	27				27		118
Foreign Currency Contract, Asset, Fair Value Disclosure	94				94		237
Assets, Fair Value Disclosure	121				121		355
Foreign Currency Contracts, Liability, Fair Value Disclosure	177				177		23
Accrued Contingent Consideration	198				198		246
Liabilities, Fair Value Disclosure	375				375		269
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	27				27		118
Foreign Currency Contract, Asset, Fair Value Disclosure	0				0		0
Assets, Fair Value Disclosure	27				27		118
Foreign Currency Contracts, Liability, Fair Value Disclosure	0				0		0
Accrued Contingent Consideration	0				0		0
Liabilities, Fair Value Disclosure	0				0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	0				0		0
Foreign Currency Contract, Asset, Fair Value Disclosure	94				94		237
Assets, Fair Value Disclosure	94				94		237
Foreign Currency Contracts, Liability, Fair Value Disclosure	177				177		23
Accrued Contingent Consideration	0				0		0
Liabilities, Fair Value Disclosure	177				177		23
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	0				0		0
Foreign Currency Contract, Asset, Fair Value Disclosure	0				0		0
Assets, Fair Value Disclosure	0				0		0
Foreign Currency Contracts, Liability, Fair Value Disclosure	0				0		0
Accrued Contingent Consideration	198				198		246
Liabilities, Fair Value Disclosure	198				198		246
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	74				74		204
Derivative Instruments in Hedges, Liabilities, at Fair Value	137				137		1
Designated as Hedging Instrument [Member] | Prepaid And Other Current Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	72				72		138
Designated as Hedging Instrument [Member] | Other Long Term Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	2				2		66
Designated as Hedging Instrument [Member] | Other current liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	31				31		1
Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	106				106		0
Not Designated as Hedging Instrument [Member] | Prepaid And Other Current Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	20				20		33
Not Designated as Hedging Instrument [Member] | Other current liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	40				40		$ 22
Not Designated as Hedging Instrument [Member] | Other, net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(7)	32			(74)	46
Net gain (loss) from foreign currency transaction exposures	1	(36)			64	(64)
Foreign Currency Transaction Gain (Loss), Realized	(6)	(4)			(10)	(18)
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(22)	13			(180)	92
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 27	$ 54			$ 107	$ 158