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Components of Net Periodic Benefit Cost (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Pension Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 11 $ 10 $ 34 $ 32
Interest cost 10 9 31 27
Expected return on assets (17) (16) (51) (47)
Amortization of:        
Prior service credit (2) (2) (6) (7)
Actuarial loss (gain) 1 8 1 22
Net benefit cost 3 9 9 27
Curtailment gain       (3)   
Settlement loss 2    3   
Total net periodic benefit cost 5 9 9 27
Other Postretirement Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost            
Interest cost            
Expected return on assets            
Amortization of:        
Prior service credit    (1) (2) (2)
Actuarial loss (gain) (1)    (1)   
Net benefit cost (1) (1) (3) (2)
Curtailment gain            
Settlement loss            
Total net periodic benefit cost $ (1) $ (1) $ (3) $ (2)