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Equity - Share-based payments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | $ 6 | $ 6 | $ 12 | $ 10
Income tax benefit |  | (1) | (1) | (1)
Total share-based compensation expense, net of income taxes | 6 | 5 | 11 | 9
Stock options |  |  |  |
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | 1 | 1 | 2 | 2
Total share-based compensation expense, net of income taxes | 1 | 1 | 2 | 2
Restricted stock units (RSUs) |  |  |  |
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | 3 | 3 | 6 | 5
Income tax benefit |  | (1) | (1) | (1)
Total share-based compensation expense, net of income taxes | 3 | 2 | 5 | 4
Performance shares and other share-based awards |  |  |  |
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | 2 | 2 | 4 | 3
Total share-based compensation expense, net of income taxes | $ 2 | $ 2 | $ 4 | $ 3

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