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Financing Arrangement (Senior Notes) (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Feb. 29, 2016
Sep. 30, 2018
Mar. 31, 2018
Feb. 24, 2016
Debt Instrument [Line Items]        
Senior Notes, Noncurrent   $ 993 $ 992 [1]  
Proceeds from Issuance of Senior Long-term Debt $ 989      
2021 Notes        
Debt Instrument [Line Items]        
Effective interest rate       3.94%
Debt Instrument, Convertible, Remaining Discount Amortization Period   2 years 5 months    
Long-term Debt       $ 600
Debt Instrument, Interest Rate, Stated Percentage       3.70%
Debt Instrument, Maturity Date Mar. 01, 2021      
2026 Notes        
Debt Instrument [Line Items]        
Effective interest rate       4.97%
Debt Instrument, Convertible, Remaining Discount Amortization Period   7 years 5 months    
Long-term Debt       $ 400
Debt Instrument, Interest Rate, Stated Percentage       4.80%
Debt Instrument, Maturity Date Mar. 01, 2026      
Senior Notes        
Debt Instrument [Line Items]        
Long-term Debt       $ 1,000
Debt Instrument, Unamortized Discount (Premium), Net   $ (1) (2) (2)
Debt Issuance Costs, Noncurrent, Net   (6) (6) $ (9)
Debt Instrument, Fair Value Disclosure   $ 1,024 $ 1,038  
Senior Notes, Frequency of Periodic Payment semiannually      
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.