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Property, plant and equipment (Details 2)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Buildings And Improvement [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 2,362
Equipment And Other Assets [Member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 22 years
Property, plant and equipment $ 45,807
Bottom of range [member] | Equipment And Other Assets [Member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 1 year
Top of range [member] | Equipment And Other Assets [Member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 31 years
Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 100,712
Gross carrying amount [member] | Buildings And Improvement [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 3,749
Gross carrying amount [member] | Equipment And Other Assets [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 96,963
Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (52,543)
Accumulated depreciation and amortisation [member] | Buildings And Improvement [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (1,387)
Accumulated depreciation and amortisation [member] | Equipment And Other Assets [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (51,156)
Total [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 48,169
Later than five years [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 5 years
Not Later Than Five Year [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 959
Not Later Than Five Year [Member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 4,789
Not Later Than Five Year [Member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ (3,830)
Later than five years and not later than ten years [member] | Bottom of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 6 years
Later than five years and not later than ten years [member] | Top of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 10 years
Later Than Five Year And Not Later Than Ten Years [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 1,938
Later Than Five Year And Not Later Than Ten Years [Member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 7,159
Later Than Five Year And Not Later Than Ten Years [Member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (5,221)
Later than ten years and not later than fifteen years [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 1,371
Later than ten years and not later than fifteen years [member] | Bottom of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 11 years
Later than ten years and not later than fifteen years [member] | Top of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 15 years
Later than ten years and not later than fifteen years [member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 4,837
Later than ten years and not later than fifteen years [member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (3,466)
Later than fifteen years and not later than twenty years [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 10,238
Later than fifteen years and not later than twenty years [member] | Bottom of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 16 years
Later than fifteen years and not later than twenty years [member] | Top of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 20 years
Later than fifteen years and not later than twenty years [member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 26,561
Later than fifteen years and not later than twenty years [member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (16,323)
Later than twenty years and not later than twenty-five years [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 17,279
Later than twenty years and not later than twenty-five years [member] | Bottom of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 21 years
Later than twenty years and not later than twenty-five years [member] | Top of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 25 years
Later than twenty years and not later than twenty-five years [member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 26,431
Later than twenty years and not later than twenty-five years [member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (9,152)
Later Than Twenty Five Years And Not Later Than Thirty Year [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 7,122
Later Than Twenty Five Years And Not Later Than Thirty Year [Member] | Bottom of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 25 years
Later Than Twenty Five Years And Not Later Than Thirty Year [Member] | Top of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 30 years
Later Than Twenty Five Years And Not Later Than Thirty Year [Member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 10,627
Later Than Twenty Five Years And Not Later Than Thirty Year [Member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ (3,505)
Later Than Thirty Years [Member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 30 years
Property, plant and equipment $ 3,218
Later Than Thirty Years [Member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 4,773
Later Than Thirty Years [Member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (1,555)
Units of production method [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 6,044
Units of production method [member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 15,535
Units of production method [member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ (9,491)