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Certain Relationships and Related Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Sidley Austin LLP |  |  |
Related Party Transaction [Line Items] |  |  |
Legal expense | $ 16 | $ 8 | $ 10

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