Fair Value Measurements (Financial Instruments' Carrying Amounts and Fair Values) (Parenthetical) (Detail) - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2025 |
Dec. 31, 2024 |
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Supplemental line of credit facility borrowings expiration period | 1 year | |
| Valuation of certain fair value hedges associated with fixed rate debt | $ 0 | $ 0 |