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Equity - Share-based payments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | $ 4 | $ 4 | $ 14 | $ 15
Income tax benefit |  | (2) | (1) | (4)
Total share-based compensation expense, net of income taxes | 4 | 2 | 13 | 11
Stock options |  |  |  |
Share-based compensation expense |  |  |  |
Pre-tax compensation expense |  | 1 | 2 | 4
Income tax benefit |  |  |  | (1)
Total share-based compensation expense, net of income taxes |  | 1 | 2 | 3
Restricted stock units (RSUs) |  |  |  |
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | 2 | 3 | 7 | 9
Income tax benefit |  | (1) | (1) | (2)
Total share-based compensation expense, net of income taxes | 2 | 2 | 6 | 7
Performance shares and other share-based awards |  |  |  |
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | 2 |  | 5 | 2
Income tax benefit |  | (1) |  | (1)
Total share-based compensation expense, net of income taxes | $ 2 | $ (1) | $ 5 | $ 1

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