Financial Instruments - Derivative Instruments Fair Value and Measurement Inputs (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Total derivatives	$ 359	$ 174
Currency exchange contracts
Derivative [Line Items]
Total derivatives	1	17
Commodity contracts
Derivative [Line Items]
Total derivatives	(131)	81
Interest rate contracts
Derivative [Line Items]
Total derivatives	(26)	(171)
Net investment hedge contracts
Derivative [Line Items]
Total derivatives	515	247
Quoted Prices in Active Markets for Identical Assets (Level 1)
Derivative [Line Items]
Total derivatives	(16)	27
Quoted Prices in Active Markets for Identical Assets (Level 1) | Currency exchange contracts
Derivative [Line Items]
Total derivatives	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity contracts
Derivative [Line Items]
Total derivatives	(16)	27
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate contracts
Derivative [Line Items]
Total derivatives	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Net investment hedge contracts
Derivative [Line Items]
Total derivatives	0	0
Significant Other Observable Inputs (Level 2)
Derivative [Line Items]
Total derivatives	375	147
Significant Other Observable Inputs (Level 2) | Currency exchange contracts
Derivative [Line Items]
Total derivatives	1	17
Significant Other Observable Inputs (Level 2) | Commodity contracts
Derivative [Line Items]
Total derivatives	(115)	54
Significant Other Observable Inputs (Level 2) | Interest rate contracts
Derivative [Line Items]
Total derivatives	(26)	(171)
Significant Other Observable Inputs (Level 2) | Net investment hedge contracts
Derivative [Line Items]
Total derivatives	515	247
Significant Unobservable Inputs (Level 3)
Derivative [Line Items]
Total derivatives	0	0
Significant Unobservable Inputs (Level 3) | Currency exchange contracts
Derivative [Line Items]
Total derivatives	0	0
Significant Unobservable Inputs (Level 3) | Commodity contracts
Derivative [Line Items]
Total derivatives	0	0
Significant Unobservable Inputs (Level 3) | Interest rate contracts
Derivative [Line Items]
Total derivatives	0	0
Significant Unobservable Inputs (Level 3) | Net investment hedge contracts
Derivative [Line Items]
Total derivatives	$ 0	$ 0