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Other income (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other Income [Line Items]
Total other income	$ 188	$ 69	$ 859	$ 258	$ 891

X

- Definition

The amount of operating income that the entity does not separately disclose in the same statement or note.

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