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Debt - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jan. 27, 2017
Sep. 30, 2016
Debt Instrument [Line Items]            
Interest payments on debt (Note 6)     $ 489,000,000 $ 244,000,000    
Short-term Debt $ 1,750,000,000   1,750,000,000     $ 0
Carrying Amount, current 1,749,000,000   1,749,000,000     $ 0
Credit Facility Expiring January 27, 2022            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity         $ 4,000,000,000.0  
Senior Notes            
Debt Instrument [Line Items]            
Interest expense $ 125,000,000 $ 125,000,000 $ 376,000,000 $ 274,000,000