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Hedging Activities - Narrative (Details)
€ in Millions, £ in Millions, $ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
CAD ($)
Sep. 30, 2019
EUR (€)
Sep. 30, 2019
GBP (£)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CAD ($)
Mar. 31, 2019
EUR (€)
Mar. 31, 2019
GBP (£)
Sep. 30, 2018
EUR (€)
Sep. 30, 2018
GBP (£)
Derivative [Line Items]                          
Long-term debt outstanding $ 7,644   $ 7,644         $ 7,595          
Gains on non-derivative net investment hedge 20   30                    
Gains from cash flow hedges recorded within other comprehensive income 13 $ 2 25 $ 2                  
Derivatives designated for hedge accounting                          
Derivative [Line Items]                          
Gain (loss) from net investment hedges recorded in earnings 91 23 67 184                  
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 | Derivatives not Designated for Hedge Accounting                          
Derivative [Line Items]                          
Notional values of financial instruments 44   44         28          
Forward contracts to offset impact of ineffectiveness of net investment hedges | Derivatives not Designated for Hedge Accounting                          
Derivative [Line Items]                          
Gain (loss) from net investment hedges recorded in earnings (20)   (39)                    
Net Investment Hedging | Derivatives designated for hedge accounting                          
Derivative [Line Items]                          
Derivatives used in net investment hedge, gains (loss) gross 20 $ 5 9 $ 39                  
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 | Derivatives designated for hedge accounting                          
Derivative [Line Items]                          
Gains from cash flow hedges recorded within other comprehensive income 17   35                    
Cash Flow Hedging | Forward contracts | Derivatives designated for hedge accounting                          
Derivative [Line Items]                          
Notional values of financial instruments 81   81                    
Cash Flow Hedging | Cross currency swap | Derivatives designated for hedge accounting                          
Derivative [Line Items]                          
Notional values of financial instruments $ 2,908   $ 2,908         $ 2,908          
Euro Denominated Notes | Term Loan                          
Derivative [Line Items]                          
Long-term debt outstanding | €           € 1,950       € 1,950   € 1,950  
British Pound Sterling Denominated Notes | Term Loan                          
Derivative [Line Items]                          
Long-term debt outstanding | £             £ 450       £ 450   £ 450