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Equity - Share-based payments (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Share-based compensation expense |  |
Pre-tax compensation expense | $ 6 | $ 4
Income tax benefit | (1) |
Total share-based compensation expense, net of income taxes | 5 | 4
Stock options |  |
Share-based compensation expense |  |
Pre-tax compensation expense | 1 | 1
Total share-based compensation expense, net of income taxes | 1 | 1
Restricted stock units (RSUs) |  |
Share-based compensation expense |  |
Pre-tax compensation expense | 3 | 2
Income tax benefit | (1) |
Total share-based compensation expense, net of income taxes | 2 | 2
Performance shares and other share-based awards |  |
Share-based compensation expense |  |
Pre-tax compensation expense | 2 | 1
Total share-based compensation expense, net of income taxes | $ 2 | $ 1

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