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Post-employment benefit plans (Tables)
 6 Months Ended
Jun. 30, 2024
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 302024202320242023
DB pension(33)(32)(66)(64)
DC pension (31)(29)(74)(68)
OPEBs(1)— (1)— 
Less:
Capitalized benefit plans cost17 13 33 26 
Total post-employment benefit plans service cost(48)(48)(108)(106)
Components of post-employment benefit plans financing cost
Components of post-employment benefit plans financing income
Three monthsSix months
For the period ended June 302024202320242023
DB pension 25 37 49 74 
OPEBs(8)(10)(16)(20)
Total net return on post-employment benefit plans17 27 33 54