Hedging Activities (Effect on Consolidated Financial Statements) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Gain recognized in other comprehensive income (OCI)	$ 31	$ 3		$ 11	$ 36
Gain/(loss) reclassified from accumulated OCI into income (effective)	4	(1)	[1]	9	(11)
Interest Rate Contracts [Member]
Gain recognized in other comprehensive income (OCI)	12			9
Interest Rate Contracts [Member] | Sales [Member]
Gain/(loss) reclassified from accumulated OCI into income (effective)					1
Interest Rate Contracts [Member] | Cost of Sales [Member]
Gain/(loss) reclassified from accumulated OCI into income (effective)				10	(11)
Foreign Exchange Contracts [Member]
Gain recognized in other comprehensive income (OCI)	19	3		2	36
Foreign Exchange Contracts [Member] | Other Expense [Member]
Gain/(loss) reclassified from accumulated OCI into income (effective)	$ 4	$ (1)	[1]	$ (1)	$ (1)

[1] The amount of hedge ineffectiveness at September 30, 2018 and 2017 was insignificant.