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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Cross-currency Swaps, Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Payments or receipts in settlement of cross-currency swaps $ 11,000,000  
Net Investment Hedging | Cross-currency swaps | Designated as Hedging Instrument    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Aggregate notional amounts   $ 1,250,000,000
Derivative asset, fair value 55,000,000  
Net Investment Hedging | Cross-currency swaps | Designated as Hedging Instrument | Other Noncurrent Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value 52,000,000  
Net Investment Hedging | Cross-currency swaps | Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value $ 3,000,000