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Equity ~Treasury Stock, Value (Details) - USD ($)
$ / shares in Thousands, shares in Millions, $ in Millions
3 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Equity, Class of Treasury Stock [Line Items]    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased   $ 1,000
Treasury Stock, Shares, Acquired 0.5  
Treasury Stock, Value, Acquired, Cost Method $ 27  
Treasury Stock Acquired, Average Cost Per Share $ 53,840  
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 973