v3.25.2
Derivative financial instruments - Information about Hedged Items Included in Consolidated Balance Sheet (Detail) - Designated as Hedging Instrument - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Carrying Amount | Long-term Debt    
Derivatives, Fair Value [Line Items]    
Hedged item $ 6,079 $ 5,184
Carrying Amount | Debt Securities, Available For Sale    
Derivatives, Fair Value [Line Items]    
Hedged item   381
Estimated Fair Value | Long-term Debt    
Derivatives, Fair Value [Line Items]    
Hedged item $ (8) (155)
Estimated Fair Value | Debt Securities, Available For Sale    
Derivatives, Fair Value [Line Items]    
Hedged item   $ 0