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Equity - Treasury stock (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Oct. 22, 2018
Treasury Stock, Common |  |  |  |  |  |  |
Treasury stock: |  |  |  |  |  |  |
Purchase/acquisition of treasury stock (in shares) | 502 |  | 107 |  | 957 | 265 |
Repurchases of common stock (in dollars) | $ 44 | $ 39 | $ 10 | $ 14 | $ 83 | $ 24 |
2018 Stock Repurchase Program |  |  |  |  |  |  |
Treasury stock: |  |  |  |  |  |  |
Shares authorized to be repurchased (in shares) |  |  |  |  |  |  | 8,000

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