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Property, plant and equipment (Details 2)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Buildings And Improvement [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 2,554
Equipment And Other Assets [Member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 20 years
Property, plant and equipment $ 58,409
Bottom of range [member] | Equipment And Other Assets [Member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 3 years
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 $ 122,668
Gross carrying amount [member] | Buildings And Improvement [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 4,495
Gross carrying amount [member] | Equipment And Other Assets [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 118,173
Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (61,705)
Accumulated depreciation and amortisation [member] | Buildings And Improvement [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (1,941)
Accumulated depreciation and amortisation [member] | Equipment And Other Assets [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (59,764)
Total [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 60,963
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 $ 954
Not Later Than Five Year [Member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 6,065
Not Later Than Five Year [Member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ (5,111)
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 $ 1,835
Later Than Five Year And Not Later Than Ten Years [Member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 8,312
Later Than Five Year And Not Later Than Ten Years [Member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (6,477)
Later than ten years and not later than fifteen years [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 3,454
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 $ 5,811
Later than ten years and not later than fifteen years [member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (2,357)
Later than fifteen years and not later than twenty years [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 11,520
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 $ 31,428
Later than fifteen years and not later than twenty years [member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (19,908)
Later than twenty years and not later than twenty-five years [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 23,923
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 $ 33,217
Later than twenty years and not later than twenty-five years [member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (9,294)
Later Than Twenty Five Years And Not Later Than Thirty Year [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 8,645
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 $ 12,915
Later Than Twenty Five Years And Not Later Than Thirty Year [Member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ (4,270)
Later Than Thirty Years [Member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 30 years
Property, plant and equipment $ 3,279
Later Than Thirty Years [Member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 5,417
Later Than Thirty Years [Member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (2,138)
Units Of Production Method [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 7,353
Units Of Production Method [Member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 19,503
Units Of Production Method [Member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ (12,150)