Variable interest entities - Schedule of results of variable interest entities (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Variable Interest Entity [Line Items]
Gross profit	$ 4,026	$ 3,675	$ 5,863	$ 5,482
Net loss	1,319	1,297	1,225	1,413
Net cash used in operating activities			719	773
Variable interest entity, primary beneficiary
Variable Interest Entity [Line Items]
Total revenues	82	98	166	194
Total cost of revenues	(85)	(89)	(165)	(176)
Gross profit	(3)	9	1	18
Net loss	$ (17)	$ (3)	(30)	(12)
Net cash used in operating activities			$ (12)	$ (2)

The aggregate cost of goods produced and sold and services rendered during the reporting period.

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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