Derivative Financial Instruments (Schedule of Derivative Instruments, Notional Amounts and Fair Values) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional amounts	[1]	$ 4,247	$ 4,080
Other Assets		159	154
Accrued Liabilities		(65)	(74)
Netting Arrangements, Other Assets		(53)	(61)
Netting Arrangements, Accrued Liabilities		53	61
Net Recorded balance, Other Assets		106	93
Net Recorded balance, Accrued Liabilities		(12)	(13)
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Notional amounts		3,141	2,930
Other Assets		138	131
Accrued Liabilities		(55)	(63)
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Notional amounts		125	125
Other Assets		3	3
Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivative [Line Items]
Notional amounts		35	56
Other Assets		4	4
Accrued Liabilities		(6)	(6)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Notional amounts		270	406
Other Assets		14	16
Accrued Liabilities		(4)	(5)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivative [Line Items]
Notional amounts		$ 676	$ 563

[1] Notional amounts represent the gross contract/notional amount of the derivatives outstanding.