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Post-employment benefit plans
 6 Months Ended
Jun. 30, 2026
Employee Benefits [Abstract]  
Post-employment benefit plans Post-employment benefit plans
Post-employment benefit plans cost
We provide pension and other benefits for most of our employees. These include defined benefit (DB) pension plans, defined contribution (DC) pension plans and other post-employment benefits (OPEBs).
Components of post-employment benefit plans service cost
Three monthsSix months
For the period ended June 302026202520262025
DB pension(27)(31)(55)(61)
DC pension (31)(30)(71)(70)
OPEBs(1)(1)(1)(1)
Less:
Capitalized benefit plans cost13 17 27 33 
Total post-employment benefit plans service cost(46)(45)(100)(99)
Components of post-employment benefit plans financing income
Three monthsSix months
For the period ended June 302026202520262025
DB pension 43 33 88 66 
OPEBs(7)(7)(15)(15)
Total net return on post-employment benefit plans36 26 73 51