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Income Taxes (Details 5) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Qualified and Non-qualified Pension Benefits
     
Benefit Plan Information      
Company contributions $ 1,079 $ 517 $ 556
United States Qualified and Non-qualified Pension Benefits
     
Benefit Plan Information      
Company contributions 752 237 290
International Qualified and Non-qualified Pension Benefits
     
Benefit Plan Information      
Company contributions 327 280 266
Postretirement Benefits
     
Benefit Plan Information      
Company contributions $ 67 $ 65 $ 62