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summary Of Significant Accounting Policies - (Schedule of Components of Investments) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Summary Of Significant Accounting Policies [Line Items]    
Total Investments $ 469 $ 440
Catalyst [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total Investments $ 332 339
Percentage Of Interest In Investments 50.00%  
Matterhorn [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Total Investments $ 90 54
Percentage Of Interest In Investments 12.50%  
Other Member    
Summary Of Significant Accounting Policies [Line Items]    
Total Investments $ 47 $ 47