Financial Instruments Fair Value of Derivatives (Details) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Gross		$ 266	$ 25	$ 45
Derivative Asset, Counterparty and Cash Collateral Netting	[1]	(110)	(18)	(11)
Derivative Asset, Net		156	7	34
Derivative Liability, Gross		108	43	10
Derivative Liability, Counterparty and Cash Collateral Netting	[1]	(103)	(16)	(10)
Derivative Liability, Net		5	27	0
Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] | Other Current Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Gross		36
Derivative Asset, Counterparty and Cash Collateral Netting	[1]	0
Derivative Asset, Net		36
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] | Other Current Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Gross		230	25	45
Derivative Asset, Counterparty and Cash Collateral Netting	[1]	(110)	(18)	(11)
Derivative Asset, Net		120	7	34
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] | Accrued and Other Current Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liability, Gross		108	43	10
Derivative Liability, Counterparty and Cash Collateral Netting	[1]	(103)	(16)	(10)
Derivative Liability, Net		$ 5	$ 27	$ 0

[1] Counterparty and cash collateral amounts represent the estimated net settlement amount when applying netting and set-off rights included in master netting arrangements between the company and its counterparties and the payable or receivable for cash collateral held or placed with the same counterparty.