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Stock-Based Compensation Schedule of Share Repurchases (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items]            
Stock Repurchased and Retired During Period, Value $ 306 $ 305 $ 299 $ 300   $ 76
Stock Repurchased and Retired During Period, Shares           0.6
May 2017 Repurchase Program [Member]            
Equity, Class of Treasury Stock [Line Items]            
Stock Repurchased and Retired During Period, Value $ 0   $ 0   $ 0  
Stock Repurchased and Retired During Period, Shares 0.0   0.0   0.0  
May 2018 Repurchase Program [Member]            
Equity, Class of Treasury Stock [Line Items]            
Stock Repurchased and Retired During Period, Value $ 306   $ 299   $ 611 $ 523
Stock Repurchased and Retired During Period, Shares 3.3   2.3   6.5 4.0
Repurchase Program, Total            
Equity, Class of Treasury Stock [Line Items]            
Stock Repurchased and Retired During Period, Value $ 306   $ 299   $ 611 $ 599
Stock Repurchased and Retired During Period, Shares 3.3   2.3   6.5 4.6