Fair Value Measurements Fair Value of Derivatives by Statement of Operations Location (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Goodwill and intangible asset impairment losses in period	$ 423
reduction of interest expense, related to amortization of previously terminated interest rate contracts	2
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives	2,661		2,469
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	(6)	(16)
Gain (Loss) in AOCI for effective portion of cash flow hedges	106		31
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	37
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	2,086		1,942
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	10
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(6)	(16)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	113	37
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Cost of products sold [Member] | Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(6)	(16)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	113	37
Not Designated as Hedging Instrument [Member] | Other, net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) from foreign currency transaction exposures	(28)	(6)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	26	3
Foreign Currency Transaction Gain (Loss), Realized	$ (2)	$ (3)