Derivative and Other Financial Instruments (Fair Values of Outstanding Derivative Instruments in the Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivative assets
Total	$ 80	$ 45
Derivative liabilities
Total	39	37
Fair Value, Inputs, Level 2 [Member] | Other Current Assets [Member] | Foreign Exchange [Member] | Designated as Hedging Instrument [Member]
Derivative assets
Derivatives designated as hedges, Foreign exchange	22	24
Fair Value, Inputs, Level 2 [Member] | Other Current Assets [Member] | Commodities [Member] | Designated as Hedging Instrument [Member]
Derivative assets
Derivatives designated as hedges, Commodities	39	13
Fair Value, Inputs, Level 2 [Member] | Other Current Assets [Member] | Commodities [Member] | Not Designated as Hedging Instrument [Member]
Derivative assets
Derivatives designated as hedges, Commodities	13	5
Fair Value, Inputs, Level 2 [Member] | Other Noncurrent Assets [Member] | Commodities [Member] | Designated as Hedging Instrument [Member]
Derivative assets
Derivatives designated as hedges, Commodities	6	3
Fair Value, Inputs, Level 2 [Member] | Accounts Payable and Accrued Liabilities [Member] | Foreign Exchange [Member] | Designated as Hedging Instrument [Member]
Derivative liabilities
Derivatives designated as hedges, Foreign exchange	24	28
Fair Value, Inputs, Level 2 [Member] | Accounts Payable and Accrued Liabilities [Member] | Foreign Exchange [Member] | Not Designated as Hedging Instrument [Member]
Derivative liabilities
Derivatives not designated as hedges, Foreign exchange	1	5
Fair Value, Inputs, Level 2 [Member] | Accounts Payable and Accrued Liabilities [Member] | Commodities [Member] | Designated as Hedging Instrument [Member]
Derivative liabilities
Derivatives designated as hedges, Commodities	13	3
Fair Value, Inputs, Level 2 [Member] | Other Noncurrent Liabilities [Member] | Commodities [Member] | Designated as Hedging Instrument [Member]
Derivative liabilities
Derivatives designated as hedges, Commodities	$ 1	$ 1