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Fair Value Measurements - Narrative (Details)
€ in Millions, $ in Millions, ¥ in Billions
Sep. 30, 2020
JPY (¥)
instrument
Sep. 30, 2020
USD ($)
instrument
Mar. 31, 2020
instrument
Sep. 30, 2019
JPY (¥)
instrument
Sep. 30, 2019
USD ($)
instrument
Sep. 30, 2018
EUR (€)
instrument
Quoted Prices in Active Markets (Level 1)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fair value of long-term debt | $   $ 4,100     $ 3,400  
Cross-currency interest rate swaps | Europe | Net investment hedging            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Number of instruments 0 0 1     2
Notional value of derivative asset | €           € 160
Cross-currency interest rate swaps | Japan | Net investment hedging            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Number of instruments 1 1   1 1  
Notional value of derivative asset | ¥ ¥ 11     ¥ 11    
Interest rate cap            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Number of instruments 2 2        
Notional value of derivative asset | $   $ 200