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Summary of Significant Accounting Policies - (Schedule of Components of Investments) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Summary Of Significant Accounting Policies [Line Items]    
Total Investments $ 718 $ 666
Catalyst [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total Investments $ 282 311
Percentage Of Interest In Investments 50.00%  
Water JV [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total Investments $ 216 216
Percentage Of Interest In Investments 30.00%  
Matterhorn [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total Investments $ 90 90
Percentage Of Interest In Investments 12.50%  
Fervo [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total Investments $ 77 0
Percentage Of Interest In Investments 14.00%  
Other [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total Investments $ 53 $ 49