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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value assets, Level 1 to Level 2 transfers amount $ 0 $ 0
Fair value assets, Level 2 to Level 1 transfers amount 0 0
Fair Value Assets Level 1 To Level 3 Transfers Amount 0 0
Fair Value Assets Level 3 To Level 1 Transfers Amount 0 0
Fair Value Assets Level 2 To Level 3 Transfers Amount 0 0
Fair Value Assets Level 3 To Level 2 Transfers Amount $ 0 $ 0