v3.26.1
Fair Value Measurements (Fair Values - Reported) (Detail) - USD ($)
$ in Billions
Mar. 31, 2026
Dec. 31, 2025
Reported Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, fair value $ 32.4 $ 32.4
Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, fair value $ 30.8 $ 31.1