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Accounting Policies - Restricted Cash (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cash and Cash Equivalents $ 810 $ 902 $ 1,227  
Restricted Cash 54 83 84  
Total Cash, Cash Equivalents and Restricted Cash $ 864 $ 985 $ 1,311 $ 1,164