Fair Value Measurements (Schedule Of Fair Value Of Financial Assets And Liabilities Measured On Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Total derivative assets	$ 27	$ 19
Total derivative liabilities	64	82
Foreign Exchange [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Derivative instruments: Foreign exchange, assets	20	15
Derivative instruments: Foreign exchange, liabilities	22	20
Commodities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Derivative instruments: Commodities, assets	7	4
Derivative instruments: Commodities, liabilities	42	62
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Total derivative assets	7	4
Total derivative liabilities	42	62
Level 1 [Member] | Foreign Exchange [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Derivative instruments: Foreign exchange, assets	0	0
Derivative instruments: Foreign exchange, liabilities
Level 1 [Member] | Commodities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Derivative instruments: Commodities, assets	7	4
Derivative instruments: Commodities, liabilities	42	62
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Total derivative assets	20	15
Total derivative liabilities	22	20
Level 2 [Member] | Foreign Exchange [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Derivative instruments: Foreign exchange, assets	20	15
Derivative instruments: Foreign exchange, liabilities	22	20
Level 2 [Member] | Commodities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Derivative instruments: Commodities, assets	0	0
Derivative instruments: Commodities, liabilities