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Financial Instruments, Derivatives and Hedging Activities - Gains (Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Gains or losses on derivatives
Amount of Gains (Losses) Recognized in OCI on Derivatives	$ 8	$ (16)	$ (17)
Amount of Gains (Losses) Reclassified from AOCI into Income	(6)	(6)	(49)
Commodity Contracts
Gains or losses on derivatives
Amount of Gains (Losses) Recognized in OCI on Derivatives	8	(22)	(15)
Commodity Contracts | Cost of Sales
Gains or losses on derivatives
Amount of Gains (Losses) Reclassified from AOCI into Income	(6)	(5)	(45)
Foreign Currency Contracts
Gains or losses on derivatives
Amount of Gains (Losses) Recognized in OCI on Derivatives		6	(2)
Foreign Currency Contracts | Net sales
Gains or losses on derivatives
Amount of Gains (Losses) Reclassified from AOCI into Income	1	1	(2)
Interest Rate Contract | Financing Costs, Net
Gains or losses on derivatives
Amount of Gains (Losses) Reclassified from AOCI into Income	(1)	$ (2)	$ (2)
Cash Flow Hedging | Commodity Contracts
Gains or losses on derivatives
Loss expected to be reclassified into earnings during the next twelve months on settled commodity hedging contracts, net of tax	(1)
Cash Flow Hedging | Treasury Lock
Gains or losses on derivatives
Loss expected to be reclassified into earnings during the next twelve months on settled T-Locks, net of tax	$ (1)

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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