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Accumulated Other Comprehensive Income (Loss) - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amounts reclassified into income     $ 50  
Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification of losses into income $ 22 $ 18 66 $ 55
Associated tax benefits, benefit plans (7) (6) (22) (19)
Amounts reclassified into income 15 12 44 36
Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification of losses into income 2 5 11 14
Associated tax benefits, cash flow hedges (1) (2) (4) (5)
Amounts reclassified into income $ 1 $ 3 $ 7 $ 9