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Restructuring and Other Charges - Activity and Reserve Balances for Restructuring Charges (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Restructuring Cost and Reserve [Line Items]    
Restructuring reserve beginning balance   $ 138
Cash payments $ (82) (213)
Restructuring charges 149 453
Other (112) (246)
Restructuring reserve ending balance 87 132
Layoff Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring reserve beginning balance   96
Cash payments (76) (191)
Restructuring charges 61 259
Other (23) (66)
Restructuring reserve ending balance 60 98
Other Exit Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring reserve beginning balance   42
Cash payments (6) (22)
Restructuring charges 88 194
Other (89) (180)
Restructuring reserve ending balance $ 27 $ 34