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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Cash, Cash Equivalents and Restricted Cash:        
Cash and cash equivalents $ 1,434 $ 180    
Restricted cash 239 140    
Total cash, cash equivalents and restricted cash shown in the Unaudited Condensed Statements of Consolidated Cash Flows $ 1,673 $ 320 $ 314 $ 206