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Employee benefits - Underfunded pension plans - Assets by category (Details) - Underfunded Pension Plans [Member] - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents, amount contributed to fair value of plan assets $ 2 $ 75
Equity securities 55 1,711
Real estate, amount contributed to fair value of plan assets 6 3
Loans to participants, amount contributed to fair value of plan assets 1 1
Other 125 168
Total 339 3,778
Loans to corporate entities [member]    
IfrsStatementLineItems [Line Items]    
Debt instruments, amount contributed to fair value of plan assets 24 556
Governmental Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Debt instruments, amount contributed to fair value of plan assets 65 816
Fixed Income [Member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 40 38
Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 13 229
Ifrs Private Equity Funds [Member]    
IfrsStatementLineItems [Line Items]    
Structured debt, amount contributed to fair value of plan assets 8 181
Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents, amount contributed to fair value of plan assets 2 70
Equity securities   3
Total 51 1,485
Level 2 of fair value hierarchy [member] | Loans to corporate entities [member]    
IfrsStatementLineItems [Line Items]    
Debt instruments, amount contributed to fair value of plan assets 24 556
Level 2 of fair value hierarchy [member] | Governmental Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Debt instruments, amount contributed to fair value of plan assets 19 683
Level 2 of fair value hierarchy [member] | Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 6 173
Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents, amount contributed to fair value of plan assets   5
Equity securities 55 1,708
Total 148 1,887
Level 1 of fair value hierarchy [member] | Governmental Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Debt instruments, amount contributed to fair value of plan assets 46 133
Level 1 of fair value hierarchy [member] | Fixed Income [Member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 40 38
Level 1 of fair value hierarchy [member] | Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 7 3
Level 3 Of Fair Values Hierarchy [Member]    
IfrsStatementLineItems [Line Items]    
Real estate, amount contributed to fair value of plan assets 6 3
Loans to participants, amount contributed to fair value of plan assets 1 1
Other 125 168
Total 140 406
Level 3 Of Fair Values Hierarchy [Member] | Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets   53
Level 3 Of Fair Values Hierarchy [Member] | Ifrs Private Equity Funds [Member]    
IfrsStatementLineItems [Line Items]    
Structured debt, amount contributed to fair value of plan assets $ 8 $ 181