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Hedging Activities - Narrative (Details)
£ in Millions, $ in Millions, $ in Millions
3 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
CAD ($)
Jun. 30, 2019
EUR (€)
Jun. 30, 2019
GBP (£)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CAD ($)
Mar. 31, 2019
EUR (€)
Mar. 31, 2019
GBP (£)
Jun. 30, 2018
EUR (€)
Derivative [Line Items]                    
Long-term debt outstanding $ 7,692         $ 7,595        
Gain (loss) from net investment hedges recorded in earnings 10                  
Derivatives used in net investment hedge, gains (loss) gross (24) $ 161                
Forward Contracts | Derivatives designated for hedge accounting                    
Derivative [Line Items]                    
Notional values of financial instruments           81        
Forward Contracts to Hedge Euro Against British Pound Cash Flows [Member] | Derivatives not Designated for Hedge Accounting                    
Derivative [Line Items]                    
Notional values of financial instruments 28         28        
Forward Contracts to Offset Impact of Ineffectiveness of Net investment Hedges [Member] | Derivatives not Designated for Hedge Accounting                    
Derivative [Line Items]                    
Gain (loss) from net investment hedges recorded in earnings (19)                  
Notional values of financial instruments 630                  
Net Investment Hedging | Derivatives designated for hedge accounting                    
Derivative [Line Items]                    
Derivatives used in net investment hedge, gains (loss) gross (11) $ 34                
Net Investment Hedging | November 2018 Cross Currency Swaps | Derivatives designated for hedge accounting                    
Derivative [Line Items]                    
Gain (loss) from net investment hedges recorded in earnings 34                  
Notional values of financial instruments     $ 1,499       $ 1,499   £ 932  
Proceeds from termination of derivative instruments 84                  
Cash Flow Hedging | Cross Currency Swap | Derivatives designated for hedge accounting                    
Derivative [Line Items]                    
Notional values of financial instruments 2,908         $ 2,908        
Cash Flow Hedging | Forward Contracts | Derivatives designated for hedge accounting                    
Derivative [Line Items]                    
Notional values of financial instruments $ 81                  
Euro Denominated Notes | Term Loan                    
Derivative [Line Items]                    
Long-term debt outstanding | €       € 1,950,000,000       € 1,950,000,000   € 1,950,000,000
British Pound Sterling Denominated Notes | Term Loan                    
Derivative [Line Items]                    
Long-term debt outstanding | £         £ 450       £ 450