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Hedging Activities - Narrative (Details)
£ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2022
EUR (€)
Mar. 31, 2022
CAD ($)
Mar. 31, 2021
EUR (€)
Mar. 31, 2021
CAD ($)
Apr. 27, 2020
USD ($)
Apr. 27, 2020
EUR (€)
Mar. 31, 2020
GBP (£)
Dec. 31, 2019
EUR (€)
Sep. 30, 2019
GBP (£)
Derivative [Line Items]                        
Total debt outstanding $ 5,879,000,000 $ 7,148,000,000                    
Gains (losses) from net investment hedges 73,000,000 (118,000,000) $ 39,000,000                  
Gains recorded in earnings for ineffectiveness of Company's non-derivative hedges     34,000,000                  
Gains (losses) recorded in other comprehensive income $ 14,000,000 (36,000,000) 86,000,000                  
Amortization of loss on derivative, term (in years) 5 years                      
Forward Contracts to Offset Impact of Ineffectiveness of Net investment Hedges | Derivatives Not Designated for Hedge Accounting                        
Derivative [Line Items]                        
Gains (losses) from contracts not designated as hedges     (44,000,000)                  
Forward Contracts to Hedge Euro Against British Pound Cash Flows | Derivatives Not Designated for Hedge Accounting                        
Derivative [Line Items]                        
Notional amounts of derivative $ 0 39,000,000                    
Net Investment Hedging | Derivatives Designated for Hedge Accounting                        
Derivative [Line Items]                        
Gains (losses) from net investment hedges (4,000,000) (119,000,000) 76,000,000                  
Net Investment Hedging | November 2018 Cross Currency Swaps | Derivatives Designated for Hedge Accounting                        
Derivative [Line Items]                        
Notional amounts of derivative         $ 500   $ 500     £ 932    
Proceeds from termination of swaps     84,000,000                  
Settlement gain recorded in earnings     34,000,000                  
Cash Flow Hedging | Derivatives Designated for Hedge Accounting                        
Derivative [Line Items]                        
Gains (losses) recorded in other comprehensive income 21,000,000 (42,000,000) $ 98,000,000                  
Cash Flow Hedging | Currency Swap | Derivatives Designated for Hedge Accounting                        
Derivative [Line Items]                        
Notional amounts of derivative 1,300,000,000 $ 2,600,000,000                    
Cash Flow Hedging | Interest Rate Swap | Derivatives Designated for Hedge Accounting                        
Derivative [Line Items]                        
Notional amounts of derivative $ 500,000,000             $ 500,000,000 € 600,000,000   € 250,000,000  
Euro Denominated Notes | Loans payable | Net Investment Hedging                        
Derivative [Line Items]                        
Total debt outstanding | €       € 1,100,000,000   € 1,700,000,000            
British Pound Sterling Denominated Notes | Loans payable                        
Derivative [Line Items]                        
Total debt outstanding | £                       £ 450