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Financing Arrangement (Senior Notes) (Details) - USD ($)
$ in Millions
6 Months Ended
Feb. 04, 2016
Sep. 30, 2020
Mar. 31, 2020
Feb. 24, 2016
Debt Instrument [Line Items]        
Proceeds from Issuance of Senior Long-term Debt $ 989      
Senior Notes, Noncurrent   $ 397 $ 397 [1]  
Senior Notes   $ 996 996  
2021 Notes        
Debt Instrument [Line Items]        
Long-term Debt       $ 600
Debt Instrument, Interest Rate, Stated Percentage       3.70%
Debt Instrument, Maturity Date Mar. 01, 2021      
Effective interest rate       3.94%
Debt Instrument, Convertible, Remaining Discount Amortization Period   4 months 24 days    
2026 Notes        
Debt Instrument [Line Items]        
Long-term Debt       $ 400
Debt Instrument, Interest Rate, Stated Percentage       4.80%
Debt Instrument, Maturity Date Mar. 01, 2026      
Effective interest rate       4.97%
Debt Instrument, Convertible, Remaining Discount Amortization Period   5 years 4 months 24 days    
Senior Notes        
Debt Instrument [Line Items]        
Long-term Debt       $ 1,000
Debt Instrument, Unamortized Discount (Premium), Net   $ (1) (1) (2)
Debt Issuance Costs, Noncurrent, Net   (3) (3) $ (9)
Senior Notes, Frequency of Periodic Payment semiannually      
Debt Instrument, Fair Value Disclosure   $ 1,082 $ 1,030  
Debt Instrument, Redemption Price, Percentage   100.00%    
Change of control repurchase event        
Debt Instrument [Line Items]        
Debt Instrument, Redemption Price, Percentage   101.00%    
[1] Derived from audited Consolidated Financial Statements.