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 |