v2.4.0.6
Consolidated Balance Sheet (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Consolidated Balance Sheet [Abstract]    
Allowance for accounts and notes receivable $ 10 $ 10
Accumulated depreciation, depletion and amortization $ 59,518 $ 58,916
Common stock, shares authorized 2,500,000,000 2,500,000,000
Common stock, par value $ 0.01 $ 0.01
Common stock, shares issued 1,764,891,853 1,762,247,949
Treasury stock, shares 542,230,673 542,230,673