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Summary of Significant Accounting Policies Asset Retirement Obligation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Entity Information [Line Items]      
Asset Retirement Obligation $ 8 $ 8 $ 8
Accretion Expense, Including Asset Retirement Obligations 0 0  
Asset Retirement Obligation, Liabilities Incurred 0 (1)  
Asset Retirement Obligation, Liabilities Settled 0 0  
Advertising Expense $ 25 $ 28 $ 24