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Debt and Derivatives - Derivatives (Detail) - Treasury Lock [Member]
$ in Millions
9 Months Ended
Sep. 30, 2024
USD ($)
Derivatives  
OCI gain (loss) for fair value changes, after tax $ (35)
Ten-year rate [Member]  
Derivatives  
Derivative notional value 900
Thirty-year rate [Member]  
Derivatives  
Derivative notional value $ 650