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Fair Value Measurements (Fair Values - Reported) (Detail) - USD ($)
$ in Billions
Jun. 30, 2025
Dec. 31, 2024
Reported Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, fair value $ 28.1 $ 26.9
Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, fair value $ 26.4 $ 25.0