Derivative Instruments and Hedging Activities (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Derivative assets
Derivative assets	$ 174	$ 76
Derivative Liabilities
Derivative Liabilities	53	107
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivative assets
Derivative assets	31	4
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative assets
Derivative assets	119	37
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Accounts Payable and Accrued Liabilities [Member]
Derivative Liabilities
Derivative Liabilities	7	9
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative Liabilities
Derivative Liabilities	26	77
Foreign Exchange Contract [Member] | Nondesignated [Member] | Other Current Assets [Member]
Derivative assets
Derivative assets	6	9
Foreign Exchange Contract [Member] | Nondesignated [Member] | Other Assets [Member]
Derivative assets
Derivative assets	4	9
Foreign Exchange Contract [Member] | Nondesignated [Member] | Accounts Payable and Accrued Liabilities [Member]
Derivative Liabilities
Derivative Liabilities	18	14
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative assets
Derivative assets	14	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	2	0
Designated as Hedging Instrument [Member]
Derivative assets
Derivative assets	164	55
Derivative Liabilities
Derivative Liabilities	33	93
Nondesignated [Member]
Derivative assets
Derivative assets	10	21
Derivative Liabilities
Derivative Liabilities	$ 20	$ 14