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Fair Value Measurements (Schedule of the Carrying Amount and Estimated Fair Value of the Company's Financial Instruments that are Recorded at Fair Value on a Recurring Basis) (Details) - Recurring [Member] - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets $ 7 $ 10
Carrying Value [Member] | Prepaid Expenses And Other Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 5 6
Carrying Value [Member] | Other Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 2 4
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 7 10
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Prepaid Expenses And Other Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 5 6
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets $ 2 $ 4