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Property, Plant And Equipment And Asset Retirement Obligations (Asset Retirement Obligations) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Property, Plant And Equipment And Asset Retirement Obligations [Abstract]    
Beginning balance $ 9,614 $ 8,473
Accretion expense and other provisions 581 563
Reduction due to property sales (854) (183)
Payments made (662) (638)
Liabilities incurred 117 1,094
Foreign currency translation (62) (45)
Revisions 1,844 350
Ending balance $ 10,578 $ 9,614