Financial Instruments Effect of Derivative Instruments (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain Recognized in Other Comprehensive Income, Pre-Tax		$ 8	$ 16
Gain (Loss) on Derivative Instruments, Net, Pretax		2	(183)
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain Recognized in Other Comprehensive Income, Pre-Tax		8	16
Gain on Hedging Activity, Pre-tax		4	1
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Commodity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain Recognized in Other Comprehensive Income, Pre-Tax	[1]	8	16
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Commodity Contract [Member] | Cost of Goods Sold
Derivative Instruments, Gain (Loss) [Line Items]
Gain on Hedging Activity, Pre-tax	[1],[2]	4	1
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, (Loss) Gain, Net, Pre-tax		(2)	(184)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Cost of Goods Sold
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, (Loss) Gain, Net, Pre-tax	[2]	7	(3)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Sundry Income - net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, (Loss) Gain, Net, Pre-tax	[3]	$ (9)	$ (181)

[1] For cash flow hedges, this represents the portion of the gain (loss) reclassified from accumulated OCI into income during the period.

[2] Recorded in cost of goods sold.

[3] Gain recognized in sundry income - net was partially offset by the related gain on the foreign currency-denominated monetary assets and liabilities of the company's operations. See Note 7 for additional information.