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Restructuring and Other Charges - Activity and Reserve Balances for Restructuring Charges (Detail) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]    
Restructuring reserve beginning balance $ 132 $ 138
Cash payments (109) (213)
Restructuring charges 200 453
Other (142) (246)
Restructuring reserve ending balance 81 132
Layoff Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring reserve beginning balance 98 96
Cash payments (100) (191)
Restructuring charges 111 259
Other (52) (66)
Restructuring reserve ending balance 57 98
Other Exit Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring reserve beginning balance 34 42
Cash payments (9) (22)
Restructuring charges 89 194
Other (90) (180)
Restructuring reserve ending balance $ 24 $ 34