Derivative Financial Instruments (Schedule of Derivative Instruments, Notional Amounts and Fair Values) (Details) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional amounts	[1]	$ 4,151	$ 4,080
Other Assets		62	154
Accrued Liabilities		(88)	(74)
Netting Arrangements, Other Assets		(30)	(61)
Netting Arrangements, Accrued Liabilities		30	61
Net Recorded balance, Other Assets		32	93
Net Recorded balance, Accrued Liabilities		(58)	(13)
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Notional amounts		2,781	2,930
Other Assets		48	131
Accrued Liabilities		(73)	(63)
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Notional amounts		125	125
Other Assets		1	3
Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivative [Line Items]
Notional amounts		40	56
Other Assets		5	4
Accrued Liabilities		(4)	(6)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Notional amounts		591	406
Other Assets		8	16
Accrued Liabilities		(11)	(5)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivative [Line Items]
Notional amounts		$ 614	$ 563

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