Derivative Instruments and Hedging Activities (Fair Values) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010		Jun. 30, 2010	Dec. 31, 2009
Fair Values by Balance Sheet Location [Abstract]
Derivative assets designated as hedging instruments	$ 887		$ 1,113
Derivative liabilities designated as hedging instruments	41		54
Derivative assets not designated as hedging instruments	1,245	[1]	1,460	[1]
Derivative liabilities not designated as hedging instruments	1,219	[1]	1,560	[1]
Net pre-tax gains (losses) included in AOCI related to derivatives not designated as hedging instruments	279		326
Accumulated after-tax net gains (losses), excluding net investment hedges, included in AOCI	544		695		761	602
Current Assets [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative assets designated as hedging instruments	704	[2]	903	[2]
Derivative assets not designated as hedging instruments	763	[1],[2]	1,015	[1],[2]
Current Assets [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative assets designated as hedging instruments	5	[2]	11	[2]
Derivative assets not designated as hedging instruments	0	[1],[2]	0	[1],[2]
Current Assets [Member] | Cross-Currency Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative assets designated as hedging instruments	0	[2]	7	[2]
Derivative assets not designated as hedging instruments	0	[1],[2]	0	[1],[2]
Current Assets [Member] | Foreign Currency Exchange Contracts [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative assets designated as hedging instruments	0	[2]	7	[2]
Derivative assets not designated as hedging instruments	4	[1],[2]	4	[1],[2]
Current Assets [Member] | Commodity Contracts [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative assets designated as hedging instruments	699	[2]	878	[2]
Derivative assets not designated as hedging instruments	759	[1],[2]	1,011	[1],[2]
Noncurrent Assets [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative assets designated as hedging instruments	183	[2]	210	[2]
Derivative assets not designated as hedging instruments	482	[1],[2]	445	[1],[2]
Noncurrent Assets [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative assets designated as hedging instruments	1	[2]	4	[2]
Derivative assets not designated as hedging instruments	0	[1],[2]	0	[1],[2]
Noncurrent Assets [Member] | Cross-Currency Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative assets designated as hedging instruments	9	[2]	37	[2]
Derivative assets not designated as hedging instruments	0	[1],[2]	0	[1],[2]
Noncurrent Assets [Member] | Commodity Contracts [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative assets designated as hedging instruments	173	[2]	169	[2]
Derivative assets not designated as hedging instruments	482	[1],[2]	445	[1],[2]
Current Liabilities [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative liabilities designated as hedging instruments	22	[2]	47	[2]
Derivative liabilities not designated as hedging instruments	795	[1],[2]	1,097	[1],[2]
Current Liabilities [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative liabilities designated as hedging instruments	16	[2]	19	[2]
Derivative liabilities not designated as hedging instruments	3	[1],[2]	2	[1],[2]
Current Liabilities [Member] | Cross-Currency Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative liabilities designated as hedging instruments	3	[2]	9	[2]
Derivative liabilities not designated as hedging instruments	0	[1],[2]	0	[1],[2]
Current Liabilities [Member] | Foreign Currency Exchange Contracts [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative liabilities designated as hedging instruments	0	[2]	0	[2]
Derivative liabilities not designated as hedging instruments	0	[1],[2]	0	[1],[2]
Current Liabilities [Member] | Commodity Contracts [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative liabilities designated as hedging instruments	3	[2]	19	[2]
Derivative liabilities not designated as hedging instruments	792	[1],[2]	1,095	[1],[2]
Noncurrent Liabilities [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative liabilities designated as hedging instruments	19	[2]	7	[2]
Derivative liabilities not designated as hedging instruments	424	[1],[2]	463	[1],[2]
Noncurrent Liabilities [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative liabilities designated as hedging instruments	0	[2]	0	[2]
Derivative liabilities not designated as hedging instruments	32	[1],[2]	32	[1],[2]
Noncurrent Liabilities [Member] | Cross-Currency Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative liabilities designated as hedging instruments	2	[2]	0	[2]
Derivative liabilities not designated as hedging instruments	0	[1],[2]	0	[1],[2]
Noncurrent Liabilities [Member] | Commodity Contracts [Member]
Fair Values by Balance Sheet Location [Abstract]
Derivative liabilities designated as hedging instruments	17	[2]	7	[2]
Derivative liabilities not designated as hedging instruments	$ 392	[1],[2]	$ 431	[1],[2]

[1] $279 million and $326 million of net gains associated with derivatives that were no longer designated as hedging instruments are recorded in AOCI at June 30, 2011 and December 31, 2010.

[2] Represents the location on the Balance Sheet.