Derivatives and Other Hedging Instruments (Schedule of the Fair Value of Derivative Instruments) (Details) (Fair Value, Measurements, Recurring [Member], Fair Value, Inputs, Level 2 [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset derivatives	$ 150		$ 253
Liability derivatives	87		36
Other Accrued Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral	44	[1]	0	[1]
Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset derivatives	62		110
Liability derivatives	10		13
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral	13		0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset derivatives	55	[1]	66	[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	7		44
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	10		12
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	0		1
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset derivatives	88		143
Liability derivatives	77		23
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	31		0
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset derivatives	0		43
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	88	[1]	100	[1]
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	76		21
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	$ 1		$ 2

[1] Cash collateral held as of December 31, 2012 represents $13 related to interest rate swap derivatives designated as hedging instruments and $31 related to foreign currency derivatives not designated as hedging instruments. No cash collateral was held as of December 31, 2011.