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Effects of Revision on Condensed Consolidated Statement of Cash Flows (Detail) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Error Corrections and Prior Period Adjustments Revision [Line Items]      
Net earnings $ 1,694 $ 2,162 $ 3,935
Deferred income tax benefit (255) (176)  
Other non-cash items, net (28) 52  
Change in other current assets (106) 17  
Change in other current liabilities (430) (796)  
Net cash provided by operating activities 1,149 1,198  
Reported
      
Error Corrections and Prior Period Adjustments Revision [Line Items]      
Net earnings   2,221  
Deferred income tax benefit   (237)  
Other non-cash items, net   46  
Change in other current assets   16  
Change in other current liabilities   (787)  
Net cash provided by operating activities   1,198  
Correction
      
Error Corrections and Prior Period Adjustments Revision [Line Items]      
Net earnings   (59)  
Deferred income tax benefit   61  
Other non-cash items, net   6  
Change in other current assets   1  
Change in other current liabilities   $ (9)