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Share-Based Compensation Plans - Share-based compensation expenses recognized (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation expense $ 76 $ 89
Restricted share units (“RSUs”)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation expense 58 63
Performance share awards (“PSAs”)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation expense 14 23
Employee share purchase plans    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation expense $ 4 $ 3