Derivative Financial Instruments (Schedule Of Notional Amounts And Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional amounts	[1]	$ 4,080	$ 3,875
Other assets		154	68
Accrued liabilities		(74)	(247)
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(61)	(45)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		61	45
Net recorded balance, Other assets		93	23
Net recorded balance, Accrued liabilities		(13)	(202)
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amounts		2,930	2,584
Other assets		131	34
Accrued liabilities		(63)	(225)
Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amounts		406	465
Other assets		16	21
Accrued liabilities		(5)	(17)
Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amounts		125	125
Other assets		3	6
Commodity Contracts [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amounts		56	53
Other assets		4	7
Accrued liabilities		(6)	(5)
Commodity Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amounts		$ 563	$ 648

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