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Accounting Policies - Restricted Cash (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Accounting Policies [Abstract]        
Cash and Cash Equivalents $ 789 $ 902 $ 1,049  
Restricted Cash 63   63  
Total Cash, Cash Equivalents and Restricted Cash $ 852 $ 985 $ 1,112 $ 1,311