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Goodwill and other intangible assets - Intangible assets - Narrative (Detail) - USD ($) $ in Billions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible asset amortization expense	$ 1.3	$ 1.3
Intangible assets with indefinite lives, excluding goodwill	$ 19.0		$ 18.9

X

- Definition

Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]

+ References

No definition available.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

+ References

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- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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