v2.4.0.8
Changes to Debt (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Debt maturing within one year, Balance at January 1, 2013 $ 4,369    
Long-term debt, Balance at January 1, 2013 47,618    
Total, Balance at January 1, 2013 51,987    
Proceeds from long-term borrowings 49,166 4,489 11,060
Repayments of long-term borrowings and capital leases obligations (8,163) (6,403) (11,805)
Decrease in short-term obligations, excluding current maturities (142) (1,437) 1,928
Reclassifications of long-term debt 3,486 3,869  
Other 743    
Debt maturing within one year, Balance at December 31, 2013 3,933 4,369  
Long-term debt, Balance at December 31, 2013 89,658 47,618  
Total, Balance at December 31, 2013 93,591 51,987  
Debt Maturing Within One Year
      
Debt Instrument [Line Items]      
Debt maturing within one year, Balance at January 1, 2013 4,369    
Repayments of long-term borrowings and capital leases obligations (3,943)    
Decrease in short-term obligations, excluding current maturities (142)    
Reclassifications of long-term debt 3,328    
Other 321    
Debt maturing within one year, Balance at December 31, 2013 3,933    
Long-term Debt
      
Debt Instrument [Line Items]      
Long-term debt, Balance at January 1, 2013 47,618    
Proceeds from long-term borrowings 49,166    
Repayments of long-term borrowings and capital leases obligations (4,220)    
Reclassifications of long-term debt (3,328)    
Other 422    
Long-term debt, Balance at December 31, 2013 $ 89,658