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Shareholders' Equity Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 04, 2019
Class of Stock [Line Items]        
Payments for Repurchase of Common Stock $ 0 $ 350 $ 350  
Final Shares Received from ASR Program       0.9
Treasury Shares        
Class of Stock [Line Items]        
Payments for Repurchase of Common Stock   $ 280    
Treasury shares acquired (using cost method), shares   6.0    
Payments for Repurchase of Common Stock   $ 280    
Treasury shares acquired, average price per share (in usd per share)   $ 43.76    
Treasury Stock Acquired Shares   6.4