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Hedging Activities - Narrative (Details)
£ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Oct. 27, 2021
USD ($)
Sep. 30, 2021
EUR (€)
Sep. 30, 2021
CAD ($)
Sep. 30, 2021
GBP (£)
Mar. 31, 2021
USD ($)
Mar. 31, 2021
EUR (€)
Mar. 31, 2021
CAD ($)
Apr. 27, 2020
USD ($)
Apr. 27, 2020
EUR (€)
Derivative [Line Items]                          
Gains (losses) from cash flow hedges recorded within other comprehensive income $ 8,000,000 $ (19,000,000) $ 8,000,000 $ (24,000,000)                  
Derivatives designated for hedge accounting                          
Derivative [Line Items]                          
Gain (loss) from net investment hedges recorded within other comprehensive income 33,000,000 (83,000,000) 11,000,000 (117,000,000)                  
Forward contracts to hedge Euro against British Pound cash flows | Derivatives not designated for hedge accounting                          
Derivative [Line Items]                          
Notional values of financial instruments 19,000,000   19,000,000           $ 39,000,000        
Net Investment Hedging | Derivatives designated for hedge accounting                          
Derivative [Line Items]                          
Derivatives used in net investment hedge, gains (losses) gross 10,000,000 (12,000,000) 5,000,000 (63,000,000)                  
Net Investment Hedging | November 2018 cross currency swaps | Derivatives designated for hedge accounting                          
Derivative [Line Items]                          
Notional values of financial instruments             $ 500       $ 500    
Cash Flow Hedging | Derivatives designated for hedge accounting                          
Derivative [Line Items]                          
Gains (losses) from cash flow hedges recorded within other comprehensive income 11,000,000 $ (23,000,000) 11,000,000 $ (28,000,000)                  
Cash Flow Hedging | Cross currency swap | Derivatives designated for hedge accounting                          
Derivative [Line Items]                          
Notional values of financial instruments $ 2,400,000,000   $ 2,400,000,000           $ 2,600,000,000        
Cash Flow Hedging | Forward starting interest rate swaps | Derivatives designated for hedge accounting                          
Derivative [Line Items]                          
Notional values of financial instruments                       $ 500,000,000 € 600,000,000
Cash Flow Hedging | Forward starting interest rate swaps | Derivatives designated for hedge accounting | Subsequent Event                          
Derivative [Line Items]                          
Notional values of financial instruments         $ 400,000,000                
Euro Denominated Notes | Term Loan | Net Investment Hedging                          
Derivative [Line Items]                          
Debt outstanding | €           € 1,100,000,000       € 1,700,000,000      
British Pound Sterling Denominated Notes | Term Loan                          
Derivative [Line Items]                          
Debt outstanding | £               £ 450          
2025 Notes | Term Loan                          
Derivative [Line Items]                          
Debt instrument term     5 years