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Financial Instruments Fair Value of Derivatives (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Asset, Gross $ 36 $ 72 $ 157
Derivative Asset, Counterparty and Cash Collateral Netting [1] (33) (35) (35)
Derivative Asset, Net 3 37 122
Derivative Liability, Gross 48 21 35
Derivative Liability, Counterparty and Cash Collateral Netting [1] (27) (15) 9
Derivative Liability, Net 21 6 44
Commodity Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Asset, Gross     4
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Asset, Gross 36 72 153
Derivative Asset, Counterparty and Cash Collateral Netting [1] (33) (35) (35)
Derivative Asset, Net 3 37 118
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 48 21 35
Derivative Liability, Counterparty and Cash Collateral Netting [1] (27) (15) 9
Derivative Liability, Net $ 21 $ 6 44
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Assets [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Asset, Gross     4
Derivative Asset, Counterparty and Cash Collateral Netting     0
Derivative Asset, Net     $ 4
[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.