Financial Instruments Fair Value of Derivatives (Details) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Gross		$ 58	$ 72
Derivative Asset, Counterparty and Cash Collateral Netting	[1]	(16)	(35)
Derivative Asset, Net		42	37
Derivative Liability, Gross		17	21
Derivative Liability, Counterparty and Cash Collateral Netting	[1]	(14)	(15)
Derivative Liability, Net		3	6
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Gross		58	72
Derivative Asset, Counterparty and Cash Collateral Netting	[1]	(16)	(35)
Derivative Asset, Net		42	37
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Accrued and Other Current Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liability, Gross		17	21
Derivative Liability, Counterparty and Cash Collateral Netting	[1]	(14)	(15)
Derivative Liability, Net		$ 3	$ 6

[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.