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Equity - Share-based payments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based compensation expense    
Pre-tax compensation expense $ 4 $ 5
Income tax benefit   (1)
Total share-based compensation expense, net of income taxes 4 4
Stock options    
Share-based compensation expense    
Pre-tax compensation expense 1 1
Total share-based compensation expense, net of income taxes 1 1
Restricted stock units (RSUs)    
Share-based compensation expense    
Pre-tax compensation expense 2 3
Income tax benefit   (1)
Total share-based compensation expense, net of income taxes 2 2
Performance shares and other share-based awards    
Share-based compensation expense    
Pre-tax compensation expense 1 1
Total share-based compensation expense, net of income taxes $ 1 $ 1