Derivatives - Cash Flow Hedges (Details) - Cash flow hedge € in Millions, $ in Millions	1 Months Ended		3 Months Ended			9 Months Ended
	Nov. 30, 2014 USD ($)	Aug. 31, 2011 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Mar. 31, 2014	Sep. 30, 2015 USD ($)	Dec. 31, 2014	Sep. 30, 2014 USD ($)	Nov. 30, 2014 EUR (€)
Derivatives in Cash Flow Hedging Relationships
Maximum length of time hedged in cash flow hedge					12 months	36 months	24 months
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative			$ 57	$ 98		$ 177		$ 86
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges			138			138
After-tax net unrealized gain (loss) anticipated to be reclassifed from AOCI to the income statement within next twelve months						109
After-tax net unrealized gain (loss) anticipated to be reclassifed from AOCI to the Income Statement over remaining fiscal year						36
After-tax net unrealized gain (loss) anticipated to be reclassifed from AOCI to the Income Statement over next fiscal year						88
After-tax net unrealized gain (loss) anticipated to be reclassifed from AOCI to the Income Statement after next fiscal year						14
Gain (Loss) on Hedged Item Recognized in Income			55	(9)		116		(8)
Foreign currency forward/option contracts
Derivatives in Cash Flow Hedging Relationships
Derivative notional amount			2,900			2,900
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative			57	103		177		90
Foreign currency forward/option contracts | Cost of Sales
Derivatives in Cash Flow Hedging Relationships
Gain (Loss) on Hedged Item Recognized in Income			55	(7)		120		(9)
Interest rate swap contracts
Derivatives in Cash Flow Hedging Relationships
Derivative notional amount		$ 400							€ 500
Term of derivative contract	12 years	5 years
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative	$ (8)	$ (7)		(2)				(2)
After tax gain (loss) within other comprehensive income	$ (5)	(4)
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges			$ (5)			(5)
Interest rate swap contracts | Fixed rate Medium term note due 2016
Derivatives in Cash Flow Hedging Relationships
Principal amount		$ 1,000
Term of debt instrument		5 years
Interest rate swap contracts | Fixed rate Euro Medium term note due 2026
Derivatives in Cash Flow Hedging Relationships
Principal amount | €									€ 750
Term of debt instrument	12 years
Interest rate swap contracts | Interest expense
Derivatives in Cash Flow Hedging Relationships
Gain (Loss) on Hedged Item Recognized in Income				(1)		(2)		(1)
Commodity price swap contracts
Derivatives in Cash Flow Hedging Relationships
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative				(3)				(2)
Commodity price swap contracts | Cost of Sales
Derivatives in Cash Flow Hedging Relationships
Gain (Loss) on Hedged Item Recognized in Income				$ (1)		$ (2)		$ 2