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Hedging Activities - Narrative (Details)
£ in Millions
12 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2021
EUR (€)
Mar. 31, 2021
CAD ($)
Dec. 31, 2020
EUR (€)
Apr. 27, 2020
USD ($)
Apr. 27, 2020
EUR (€)
Mar. 31, 2020
EUR (€)
Mar. 31, 2020
CAD ($)
Dec. 31, 2019
EUR (€)
Sep. 30, 2019
GBP (£)
Mar. 31, 2019
GBP (£)
Derivative [Line Items]                          
Total debt outstanding $ 7,148,000,000 $ 7,387,000,000                      
Gains (losses) from net investment hedges (118,000,000) 39,000,000 $ 259,000,000                    
Gains recorded in earnings for ineffectiveness of Company's non-derivative hedges   34,000,000                      
Gains (losses) recorded in other comprehensive income (36,000,000) 86,000,000 24,000,000                    
Currency Swap | Derivatives Designated for Hedge Accounting                          
Derivative [Line Items]                          
Notional amounts of derivative 2,600,000,000 2,900,000,000                      
Forward Contracts and Cross Currency Swaps                          
Derivative [Line Items]                          
Gains (losses) recorded in other comprehensive income (42,000,000) 98,000,000 28,000,000                    
Foreign Exchange Contract | Derivatives Not Designated for Hedge Accounting | United Kingdom, Pounds                          
Derivative [Line Items]                          
Notional amounts of derivative 39,000,000 29,000,000                      
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   (44,000,000)                      
Net Investment Hedging                          
Derivative [Line Items]                          
Gains (losses) recorded in other comprehensive income $ (119,000,000) 76,000,000 $ 53,000,000                    
Net Investment Hedging | November 2018 Cross Currency Swaps | Derivatives Designated for Hedge Accounting                          
Derivative [Line Items]                          
Notional amounts of derivative         $ 500,000,000         $ 1,500,000,000     £ 932
Notional amount of derivatives that matured         $ 999,000,000                
Proceeds from termination of swaps   84,000,000                      
Settlement gain recorded in earnings   $ 34,000,000                      
Cash Flow Hedging | Interest Rate Swap | Derivatives Designated for Hedge Accounting                          
Derivative [Line Items]                          
Notional amounts of derivative             $ 500,000,000 € 600,000,000          
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         € 1,700,000,000        
British Pound Sterling Denominated Notes | Notes                          
Derivative [Line Items]                          
Total debt outstanding | £                       £ 450 £ 450