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Business Restructuring Charges - Summary of Restructuring Accrual Activity (Detail)
$ in Millions
6 Months Ended
Mar. 31, 2017
USD ($)
Restructuring Reserve [Roll Forward]  
Balance at September 30, 2016 $ 69
Charged to expense 46
Cash payments (45)
Non-cash settlements (6)
Other adjustments 7
Balance at March 31, 2017 58
Employee Termination  
Restructuring Reserve [Roll Forward]  
Balance at September 30, 2016 67
Charged to expense 18
Cash payments (28)
Non-cash settlements 0
Other adjustments 0
Balance at March 31, 2017 57
Other  
Restructuring Reserve [Roll Forward]  
Balance at September 30, 2016 2
Charged to expense 29
Cash payments (17)
Non-cash settlements (6)
Other adjustments 7
Balance at March 31, 2017 $ 1