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Share Repurchase Program (Purchase of Outstanding Shares) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 22 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023
Share Repurchase Program [Abstract] |  |  |  |  |
Number of shares purchased | 1,100,000 | 800,000 | 1,100,000 | 1,900,000 | 5,552,053
Average price paid per share | $ 31.43 | $ 22.16 | $ 31.43 | $ 30.51 |
Cost of share purchased | $ 34 | $ 19 | $ 34 | $ 59 | $ 195

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