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Equity - Share-based payments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | $ 8 | $ 6 | $ 15 | $ 11
Income tax benefit | (1) | (1) | (2) | (1)
Total share-based compensation expense, net of income taxes | 7 | 5 | 13 | 10
Employee Stock Option |  |  |  |
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
RSU |  |  |  |
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | 3 | 3 | 6 | 6
Income tax benefit | (1) | (1) | (1) | (1)
Total share-based compensation expense, net of income taxes | 2 | 2 | 5 | 5
Performance shares and other share-based awards |  |  |  |
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | 4 | 2 | 7 | 3
Income tax benefit |  |  | (1) |
Total share-based compensation expense, net of income taxes | $ 4 | $ 2 | $ 6 | $ 3

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