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Equity - Share-based payments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Share-based compensation expense    
Pre-tax compensation expense $ 7 $ 5
Income tax benefit (1)  
Total share-based compensation expense, net of income taxes 6 5
Employee Stock Option    
Share-based compensation expense    
Pre-tax compensation expense 1 1
Total share-based compensation expense, net of income taxes 1 1
RSU    
Share-based compensation expense    
Pre-tax compensation expense 3 3
Total share-based compensation expense, net of income taxes 3 3
Performance shares and other share-based awards    
Share-based compensation expense    
Pre-tax compensation expense 3 1
Income tax benefit (1)  
Total share-based compensation expense, net of income taxes $ 2 $ 1