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Post-employment benefit plans (Tables)
 6 Months Ended
Jun. 30, 2025
Employee Benefits [Abstract]  
Components of post-employment benefit plans service cost
Components of post-employment benefit plans service cost
Three monthsSix months
For the period ended June 302025202420252024
DB pension(31)(33)(61)(66)
DC pension (30)(31)(70)(74)
OPEBs(1)(1)(1)(1)
Less:
Capitalized benefit plans cost17 17 33 33 
Total post-employment benefit plans service cost(45)(48)(99)(108)
Components of post-employment benefit plans financing cost
Components of post-employment benefit plans financing income
Three monthsSix months
For the period ended June 302025202420252024
DB pension 33 25 66 49 
OPEBs(7)(8)(15)(16)
Total net return on post-employment benefit plans26 17 51 33