Fair Value Measurements Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	$ 1,987		$ 2,178
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	(49)	21
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	142
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance	246		217
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	2,365		2,470
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness	8	10
Gain (loss) recognized in earnings for terminated interest rate swaps	35
Unamortized gains on senior notes	43		45
Unamortized losses on senior notes	1		2
Unrealized gain on interest rate cash flow hedges, pretax, AOCI	1		2
reduction of interest expense, related to amortization of previously terminated interest rate contracts	2
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	13
Derivative Assets	471		444
Derivative Liabilities	53		36
Accrued Contingent Consideration	(202)		(274)
Time Deposits, at Carrying Value	53		255
Cash	169		181
Cost-method Investments, Aggregate Carrying Amount	27		27
Asset Impairment Charges		55
Debt Instrument, Fair Value Disclosure	4,653		4,613
Loss on hedged debt obligation [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense, Other	8	10
Fair Value, Inputs, Level 1 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Derivative Assets, at Fair Value	0		0
Fair Value, Inputs, Level 2 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	0
Fair Value, Inputs, Level 3 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Derivative Assets, at Fair Value	0		0
Fair Value, Measurements, Recurring [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	20		151
Foreign Currency Contract, Asset, Fair Value Disclosure	471		419
Interest Rate Derivative Assets, at Fair Value	0		25
Assets, Fair Value Disclosure	491		595
Foreign Currency Contracts, Liability, Fair Value Disclosure	53		36
Accrued Contingent Consideration	202		274
Liabilities, Fair Value Disclosure	255		310
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	20		151
Foreign Currency Contract, Asset, Fair Value Disclosure	0		0
Assets, Fair Value Disclosure	20		151
Foreign Currency Contracts, Liability, Fair Value Disclosure	0		0
Accrued Contingent Consideration	0		0
Liabilities, Fair Value Disclosure	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
Foreign Currency Contract, Asset, Fair Value Disclosure	471		419
Interest Rate Derivative Assets, at Fair Value	0		25
Assets, Fair Value Disclosure	471		444
Foreign Currency Contracts, Liability, Fair Value Disclosure	53		36
Accrued Contingent Consideration	0		0
Liabilities, Fair Value Disclosure	53		36
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
Foreign Currency Contract, Asset, Fair Value Disclosure	0		0
Assets, Fair Value Disclosure	0		0
Foreign Currency Contracts, Liability, Fair Value Disclosure	0		0
Accrued Contingent Consideration	202		274
Liabilities, Fair Value Disclosure	202		274
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount				450
Interest rate swaps terminated in Q1 2015 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accrued Investment Income Receivable	7
Unamortized gains on senior notes	30
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	364		344
Derivative Instruments in Hedges, Liabilities, at Fair Value	1		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	204		178
Designated as Hedging Instrument [Member] | Other Long Term Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	160		141
Designated as Hedging Instrument [Member] | Other current liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	1		1
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	107		100
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	52		35
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	23	(3)
Net gain (loss) from foreign currency transaction exposures	(33)	0
Foreign Currency Transaction Gain (Loss), Realized	(10)	(3)
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	93	(21)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	49	21
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Cost of products sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	93	(21)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	49	21
Interest Rate Contract [Member] | 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	0		3
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Long Term Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	$ 0		$ 22