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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Intangible Assets) (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]      
Accumulated Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships $ 109 $ 102  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 6    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 6    
Other Intangible Assets [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-lived Intangible Assets Acquired 14 22  
Accumulated Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships 20 17  
Amortization of Intangible Assets 3 $ 4 $ 4
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 3    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 3    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 3    
Finite-Lived Intangible Assets, Amortization Expense, Year Four $ 3