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Equity - Share-based payments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | $ 4 | $ 6 | $ 15 | $ 18
Income tax benefit |  | (1) | (1) | (2)
Total share-based compensation expense, net of income taxes | 4 | 5 | 14 | 16
Employee Stock Option [Member] |  |  |  |
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | 1 | 1 | 3 | 3
Total share-based compensation expense, net of income taxes | 1 | 1 | 3 | 3
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | 2 | 3 | 8 | 9
Income tax benefit |  |  | (1) | (1)
Total share-based compensation expense, net of income taxes | 2 | 3 | 7 | 8
Performance shares and other share-based awards |  |  |  |
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | 1 | 2 | 4 | 6
Income tax benefit |  | (1) |  | (1)
Total share-based compensation expense, net of income taxes | $ 1 | $ 1 | $ 4 | $ 5

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