Employee benefits (Details 6) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Employee Benefits
Service cost	$ 36	$ 38	$ 39
Interest expense	442	391	493
Interest income	(460)	(387)	(514)
Interest expense on effect of (asset ceiling) / onerous liability	107	69	104
Others		5	11
Total of cost, net	$ 125	$ 116	$ 133

The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [domain]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration