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Equity and Accumulated Other Comprehensive Earnings - Share repurchase program (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 2 Months Ended
Jun. 30, 2019
May 31, 2019
Jun. 30, 2019
Jan. 23, 2019
Share Repurchase Program        
Accelerated stock repurchase agreement   $ 250    
Cash advanced for accelerated stock repurchase agreement   $ 250    
Treasury Stock, Shares, Acquired 0.1 3.4    
Shares received as percentage of total shares calculated using closing price on agreement date   85.00%    
Average price paid per share     $ 62.33  
Maximum        
Share Repurchase Program        
Number of shares authorized for repurchase       50.0