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Summary Of Significant Accounting Policies (Schedule of Components of Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items]    
Investments $ 440 $ 402
Catalyst [Member]    
Summary Of Significant Accounting Policies [Line Items]    
% Interest 50.00%  
Investments $ 339 368
Matterhorn [Member]    
Summary Of Significant Accounting Policies [Line Items]    
% Interest 12.50%  
Investments $ 54  
Other [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Investments $ 47 $ 34