Gains And Losses Recognized In Consolidated Statement Of Operations On Qualifying And Non-Qualifying Financial Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ 7	$ 7		$ (12)
Derivative, Gain (Loss) on Derivative, Net	0	0		0
Interest Income Expense [Member] | Debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	0		(3)
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(9)	5		2
Not Designated as Hedging Instrument [Member] | Cost Of Products Sold [Member] | Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0		(4)
Not Designated as Hedging Instrument [Member] | Cost Of Products Sold [Member] | Energy Related Derivative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(10)	0		(7)
Not Designated as Hedging Instrument [Member] | Interest Income Expense [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	1	5	[1]	13	[2]
Designated as Hedging Instrument [Member] | Cost Of Products Sold [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	8	7		(12)
Designated as Hedging Instrument [Member] | Cost Of Products Sold [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(1)	0		0
Designated as Hedging Instrument [Member] | Interest Income Expense [Member] | Fair Value Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 0	$ 0		$ 3

[1] Excluding gain of $2 million related to debt reduction recorded to Restructuring and other charges.

[2] Excluding gain of $3 million related to debt reduction recorded to Restructuring and other charges.