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Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
May 31, 2017
Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Gain (Loss) on Derivative Used in Net Investment Hedge, Net of Tax     $ 57      
Reclassification of terminated interest rate swaps to interest expense within the next 12 months $ 5   5      
Fair Value Hedging            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Gains (losses) on fair value hedges 1 $ 3 (14) $ 9    
Forward exchange contracts            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional amount 1,300   1,300     $ 2,300
Interest rate swaps | Cash Flow Hedges            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional amount         $ 1,750 500
Fixed to Floating | Fair Value Hedging            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional amount $ 375   $ 375     $ 375
Debt instrument, interest rate 3.125%   3.125%      
Debt | Net Investment Hedging            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional amount $ 1,900   $ 1,900