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Common shares (Details) - USD ($)
$ / shares in Units, $ in Millions
Apr. 26, 2019
Jun. 30, 2019
Dec. 31, 2018
Jul. 02, 2018
Dec. 31, 2017
Class of Stock [Line Items]          
Common stock, shares issued (in shares)     100,000,000 100,000,000  
Common stock, value     $ 10    
Common shares, par value (in dollars per share)   $ 0.10 $ 0.10    
Performance shares          
Class of Stock [Line Items]          
Performance shares, granted (in shares) 1,800,000        
Predecessor          
Class of Stock [Line Items]          
Common stock, shares issued (in shares)         508,763,020
Common stock, value         $ 1,017
Treasury shares (in shares)         (4,244,080,000,000)
Treasury shares, value         $ (9)
Common shares, par value (in dollars per share)     2.00    
Predecessor | Treasury stock          
Class of Stock [Line Items]          
Common shares, par value (in dollars per share)     $ 2.00