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Derivative financial instruments - Information about Hedged Items Included in Consolidated Balance Sheet (Detail) - Designated as Hedging Instrument - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Carrying Amount |  |
Derivatives, Fair Value [Line Items] |  |
Hedged item | $ 5,986 | $ 6,072
Estimated Fair Value |  |
Derivatives, Fair Value [Line Items] |  |
Hedged item | $ (103) | $ (16)

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