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Property, plant and equipment (Details 2)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Buildings And Improvement [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 2,426
Equipment And Other Assets [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 55,147
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 $ 109,654
Gross carrying amount [member] | Buildings And Improvement [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 4,225
Gross carrying amount [member] | Equipment And Other Assets [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 105,429
Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (52,081)
Accumulated depreciation and amortisation [member] | Buildings And Improvement [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (1,799)
Accumulated depreciation and amortisation [member] | Equipment And Other Assets [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (50,282)
Total [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 57,573
Not Later Than Five Year [Member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 5 years
Property, plant and equipment $ 868
Not Later Than Five Year [Member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 4,762
Not Later Than Five Year [Member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (3,894)
Later Than Five Year And Not Later Than Ten Years [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 2,028
Later Than Five Year And Not Later Than Ten Years [Member] | Bottom of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 6 years
Later Than Five Year 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] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 8,316
Later Than Five Year And Not Later Than Ten Years [Member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (6,288)
Later than ten years and not later than fifteen years [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 3,675
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 $ 5,442
Later than ten years and not later than fifteen years [member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (1,767)
Later than fifteen years and not later than twenty years [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 11,115
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 $ 27,705
Later than fifteen years and not later than twenty years [member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (16,590)
Later than twenty years and not later than twenty-five years [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 22,486
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 $ 30,195
Later than twenty years and not later than twenty-five years [member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (7,709)
Later Than Twenty Five Years And Not Later Than Thirty Year [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ 8,247
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 $ 11,727
Later Than Twenty Five Years And Not Later Than Thirty Year [Member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ (3,480)
Later Than Thirty Years [Member]  
IfrsStatementLineItems [Line Items]  
Estimated useful life 30 years
Property, plant and equipment $ 2,745
Later Than Thirty Years [Member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 4,600
Later Than Thirty Years [Member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment (1,855)
Units Of Production Method [Member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 6,409
Units Of Production Method [Member] | Gross carrying amount [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment 16,907
Units Of Production Method [Member] | Accumulated depreciation and amortisation [member]  
IfrsStatementLineItems [Line Items]  
Property, plant and equipment $ (10,498)