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Summary of Significant Accounting Policies - Capitalized Interest (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Summary of Significant Accounting Policies |  |  |
Total interest costs | $ 388 | $ 473 | $ 485
Total capitalized interest costs | $ 13 | $ 16 | $ 21

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