Other income (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other Income [Table]
Total other income	$ 859	$ 32	$ 233	$ 891	$ 297

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

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