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Equity - Treasury stock (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Oct. 22, 2018
Treasury stock:            
Purchase/acquisition of treasury stock (in shares) 107   0 265 0  
Treasury Stock            
Treasury stock:            
Repurchases of common stock (in dollars) $ 10 $ 14   $ 24    
2018 Stock Repurchase Program            
Treasury stock:            
Shares authorized to be repurchased (in shares)           8,000