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Restructuring and Other Charges - Activity and Reserve Balances for Restructuring Charges (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]          
Restructuring and other charges $ 209 $ 151 $ 780 $ 402  
Other layoff cost including reclassification in pension cost     216   185
Asset Retirement Obligations [Member]
         
Restructuring Cost and Reserve [Line Items]          
Restructuring and other charges     95   58
Environmental Remediation [Member]
         
Restructuring Cost and Reserve [Line Items]          
Restructuring and other charges     47   12
Pension Costs [Member]
         
Restructuring Cost and Reserve [Line Items]          
Other layoff cost including reclassification in pension cost   $ 78 $ 18 $ 78 $ 92