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Equity - Treasury stock (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Oct. 22, 2018
Treasury stock: |  |  |  |  |  |  |
Purchase/acquisition of treasury stock (in shares) | 500 |  |  | 0 | 765 | 0 |
Treasury Stock [Member] |  |  |  |  |  |  |
Treasury stock: |  |  |  |  |  |  |
Repurchases of common stock (in dollars) | $ 44 | $ 10 | $ 14 |  | $ 68 |  |
2018 Stock Repurchase Program |  |  |  |  |  |  |
Treasury stock: |  |  |  |  |  |  |
Shares authorized to be repurchased (in shares) |  |  |  |  |  |  | 8,000

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