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Equity - Share-based payments (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based compensation expense |  |  |
Pre-tax compensation expense | $ 23 | $ 18 | $ 21
Income tax benefit | (2) | (2) | (3)
Total share-based compensation expense, net of income taxes | $ 21 | 16 | 18
Stock Incentive Plan |  |  |
Shares authorized under Stock Incentive Plan | 8.0 |  |
Shares available for future grants under Stock Incentive Plan | 2.1 |  |
Stock options |  |  |
Share-based compensation expense |  |  |
Pre-tax compensation expense | $ 4 | 3 | 5
Income tax benefit |  |  | (1)
Total share-based compensation expense, net of income taxes | 4 | 3 | 4
Restricted stock units (RSUs) | Employee |  |  |
Share-based compensation expense |  |  |
Pre-tax compensation expense | 12 | 10 | 12
Income tax benefit | (1) | (2) | (2)
Total share-based compensation expense, net of income taxes | 11 | 8 | 10
Performance shares and other share-based awards |  |  |
Share-based compensation expense |  |  |
Pre-tax compensation expense | 7 | 5 | 4
Income tax benefit | (1) |  |
Total share-based compensation expense, net of income taxes | $ 6 | $ 5 | $ 4

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