Derivative Instruments and Hedging Activities (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Derivative assets
Derivative assets	$ 69	$ 76
Derivative Liabilities
Derivative Liabilities	179	107
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivative assets
Derivative assets	9	4
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative assets
Derivative assets	0	37
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Accounts Payable and Accrued Liabilities [Member]
Derivative Liabilities
Derivative Liabilities	19	9
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative Liabilities
Derivative Liabilities	134	77
Foreign Exchange Contract [Member] | Nondesignated [Member] | Other Current Assets [Member]
Derivative assets
Derivative assets	25	9
Foreign Exchange Contract [Member] | Nondesignated [Member] | Other Assets [Member]
Derivative assets
Derivative assets	23	9
Foreign Exchange Contract [Member] | Nondesignated [Member] | Accounts Payable and Accrued Liabilities [Member]
Derivative Liabilities
Derivative Liabilities	20	14
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative assets
Derivative assets	12	14
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Accounts Payable and Accrued Liabilities [Member]
Derivative Liabilities
Derivative Liabilities	0	7
Commodity Contract [Member] | Nondesignated [Member] | Other Current Assets [Member]
Derivative assets
Derivative assets	0	3
Commodity Contract [Member] | Nondesignated [Member] | Accounts Payable and Accrued Liabilities [Member]
Derivative Liabilities
Derivative Liabilities	6	0
Designated as Hedging Instrument [Member]
Derivative assets
Derivative assets	21	55
Derivative Liabilities
Derivative Liabilities	153	93
Nondesignated [Member]
Derivative assets
Derivative assets	48	21
Derivative Liabilities
Derivative Liabilities	$ 26	$ 14