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Hedging Activities - Narrative (Details)
£ in Millions, $ in Millions
3 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
EUR (€)
Jun. 30, 2021
CAD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2021
EUR (€)
Mar. 31, 2021
CAD ($)
Jun. 30, 2020
EUR (€)
Apr. 27, 2020
USD ($)
Apr. 27, 2020
EUR (€)
Sep. 30, 2019
GBP (£)
Derivative [Line Items]                      
Gains (losses) from cash flow hedges recorded within other comprehensive income $ 0 $ (5,000,000)                  
Derivatives designated for hedge accounting                      
Derivative [Line Items]                      
Gain (loss) from net investment hedges recorded within other comprehensive income (22,000,000) (34,000,000)                  
Forward contracts to hedge Euro against British Pound cash flows | Derivatives not designated for hedge accounting                      
Derivative [Line Items]                      
Notional values of financial instruments 54,000,000       $ 39,000,000            
Net Investment Hedging | Derivatives designated for hedge accounting                      
Derivative [Line Items]                      
Derivatives used in net investment hedge, gains (losses) gross (5,000,000) (51,000,000)                  
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 0 $ (5,000,000)                  
Cash Flow Hedging | Cross currency swap | Derivatives designated for hedge accounting                      
Derivative [Line Items]                      
Notional values of financial instruments $ 2,600,000,000       $ 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  
Euro Denominated Notes | Term Loan                      
Derivative [Line Items]                      
Long-term debt outstanding | €               € 1,700,000,000      
Euro Denominated Notes | Term Loan | Net Investment Hedging                      
Derivative [Line Items]                      
Long-term debt outstanding | €     € 1,700,000,000     € 1,700,000,000          
British Pound Sterling Denominated Notes | Term Loan                      
Derivative [Line Items]                      
Long-term debt outstanding | £                     £ 450
2025 Notes | Term Loan                      
Derivative [Line Items]                      
Debt instrument term 5 years