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Hedging Activities - Narrative (Details)
£ in Millions, $ in Millions, $ in Billions
12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2020
EUR (€)
Mar. 31, 2020
CAD ($)
Dec. 31, 2019
EUR (€)
Sep. 30, 2019
GBP (£)
Mar. 31, 2019
EUR (€)
Mar. 31, 2019
GBP (£)
Mar. 31, 2019
CAD ($)
Derivative [Line Items]                    
Total debt outstanding $ 7,387 $ 7,595                
Gains (losses) from net investment hedges 39 259 $ (268)              
Gains recorded in earnings for ineffectiveness of Company's non-derivative hedges 34                  
Gains (losses) from fair value hedge recorded in earnings 6                  
Gains (losses) recorded in other comprehensive income 86 24 (30)              
Forward Contracts | Derivatives Designated for Hedge Accounting                    
Derivative [Line Items]                    
Notional amounts of derivative   81                
Currency Swap | Derivatives Designated for Hedge Accounting                    
Derivative [Line Items]                    
Notional amounts of derivative 2,900 2,900                
Forward Contracts and Cross Currency Swaps                    
Derivative [Line Items]                    
Gains (losses) recorded in other comprehensive income 98 28 (30)              
Foreign Exchange Contract | Derivatives Not Designated for Hedge Accounting | United Kingdom, Pounds                    
Derivative [Line Items]                    
Notional amounts of derivative 29 28                
Forward Contracts to Offset Impact of Ineffectiveness of Net investment Hedges | Derivatives Not Designated for Hedge Accounting                    
Derivative [Line Items]                    
Notional amounts of derivative | €           € 250,000,000        
Gains (losses) from contracts not designated as hedges (44)                  
Net Investment Hedging                    
Derivative [Line Items]                    
Gains (losses) recorded in other comprehensive income 76 $ 53 $ (7)              
Net Investment Hedging | November 2018 Cross Currency Swaps | Derivatives Designated for Hedge Accounting                    
Derivative [Line Items]                    
Notional amounts of derivative         $ 1.5       £ 932 $ 1.5
Proceeds from termination of swaps 84                  
Settlement gain recorded in earnings $ 34                  
Euro Denominated Notes | Notes                    
Derivative [Line Items]                    
Total debt outstanding | €           € 250,000,000        
Euro Denominated Notes | Notes | Net Investment Hedging                    
Derivative [Line Items]                    
Total debt outstanding | €       € 1,700,000,000       € 1,950,000,000    
British Pound Sterling Denominated Notes | Notes                    
Derivative [Line Items]                    
Total debt outstanding | £             £ 450   £ 450