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Capital Stock - Dividends Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Equity [Abstract] |  |  |  |  |  |  |  |
Fixed (in dollars per share) | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.60 | $ 0.45
Variable (in dollars per share) | 0 | 0 | 0.37 | 0.50 | 0.45 | 0.41 | 0.37 | 1.36
Total (in dollars per share) | $ 0.20 | $ 0.20 | $ 0.57 | $ 0.65 | $ 0.60 | $ 0.56 | $ 0.97 | $ 1.81
Total dividends | $ 153 | $ 153 | $ 438 | $ 519 | $ 484 | $ 455 | $ 744 | $ 1,458

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