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Employee benefits (Details 9) - Overfunded Pension Plans [Member] - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents $ 28 $ 14
Equity securities 69 261
International investments 106 245
Real estate 212 235
Loans to participants 142 162
Other 924 187
Total 6,039 7,835
Funds not related to risk plans (1,723) (2,178)
Fair value of plan assets at end of year 4,316 5,657
Loans to corporate entities [member]    
IfrsStatementLineItems [Line Items]    
Debt securities 196 396
Governmental Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Debt securities 2,800 4,175
Fixed Income [Member]    
IfrsStatementLineItems [Line Items]    
Investments funds 1,123 1,553
Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Investments funds 376 484
Private Equity Funds [Member]    
IfrsStatementLineItems [Line Items]    
Structured investments - Private Equity funds 63 123
Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents
Equity securities 69 261
International investments 55 59
Total 4,144 6,008
Level 1 of fair value hierarchy [member] | Governmental Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Debt securities 2,521 3,814
Level 1 of fair value hierarchy [member] | Fixed Income [Member]    
IfrsStatementLineItems [Line Items]    
Investments funds 1,123 1,391
Level 1 of fair value hierarchy [member] | Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Investments funds 376 483
Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 28 14
International investments   186
Total 523 1,171
Level 2 of fair value hierarchy [member] | Loans to corporate entities [member]    
IfrsStatementLineItems [Line Items]    
Debt securities 196 396
Level 2 of fair value hierarchy [member] | Governmental Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Debt securities 279 361
Level 2 of fair value hierarchy [member] | Fixed Income [Member]    
IfrsStatementLineItems [Line Items]    
Investments funds   162
Level 2 of fair value hierarchy [member] | Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Investments funds   1
Level 2 of fair value hierarchy [member] | Private Equity Funds [Member]    
IfrsStatementLineItems [Line Items]    
Structured investments - Private Equity funds 20 51
Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents
International investments 51  
Real estate 212 235
Loans to participants 142 162
Other 924 187
Total 1,372 656
Level 3 of fair value hierarchy [member] | Private Equity Funds [Member]    
IfrsStatementLineItems [Line Items]    
Structured investments - Private Equity funds $ 43 $ 72