Financial Instruments (Schedule of the Fair Value of Derivative Instruments) (Details) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 2 [Member] - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset derivatives	[1]	$ 74	$ 265
Liability derivatives	[1]	84	73
Derivative assets and liabilities subject to master netting arrangement		35	67
Other accrued liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral	[2],[3]	7	47
Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset derivatives		0	11
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral		0	6
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Accounts and Notes Receivable, Net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset derivatives	[2]	0	1
Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] | Accounts and Notes Receivable, Net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset derivatives		0	10
Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] | Other accrued liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability derivatives		0	10
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability derivatives		84	63
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral		7	41
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] | Accounts and Notes Receivable, Net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset derivatives	[3]	74	254
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] | Other accrued liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability derivatives		80	62
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other accrued liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability derivatives		$ 4	$ 1

[1] The company's derivative assets and liabilities subject to enforceable master netting arrangements totaled $35 at December 31, 2015 and $67 at December 31, 2014.

[2] Cash collateral held as of December 31, 2015 and 2014 represents $0 and $6, respectively, related to interest rate swap derivatives designated as hedging instruments.

[3] Cash collateral held as of December 31, 2015 and 2014 represents $7 and $41, respectively, related to foreign currency derivatives not designated as hedging instruments.