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Employee benefits - Overfunded pension plans - Assets by category (Details) - Overfunded 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 $ 55 $ 1
Equity securities 1,115  
International investments, amount contributed to fair value of plan assets 254 91
Real estate, amount contributed to fair value of plan assets 293 212
Loans to participants, amount contributed to fair value of plan assets 128 106
Total 8,062 5,301
Amount of funds not related to risk employee benefit plans [1] (1,722) (1,549)
Plan assets, at fair value 6,340 3,752
Loans to corporate entities [member]    
IfrsStatementLineItems [Line Items]    
Debt instruments, amount contributed to fair value of plan assets 368 75
Governmental Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Debt instruments, amount contributed to fair value of plan assets 3,789 2,042
Fixed Income [Member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 1,173 2,085
Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 456 452
Ifrs Private Equity Funds [Member]    
IfrsStatementLineItems [Line Items]    
Structured debt, amount contributed to fair value of plan assets 428 232
Ifrs Real Estate Funds [Member]    
IfrsStatementLineItems [Line Items]    
Structured debt, amount contributed to fair value of plan assets 3 5
Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents, amount contributed to fair value of plan assets 55 1
International investments, amount contributed to fair value of plan assets 231  
Total 1,410 379
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 367 74
Level 2 of fair value hierarchy [member] | Governmental Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Debt instruments, amount contributed to fair value of plan assets 435  
Level 2 of fair value hierarchy [member] | Fixed Income [Member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 133 175
Level 2 of fair value hierarchy [member] | Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 1  
Level 2 of fair value hierarchy [member] | Ifrs Private Equity Funds [Member]    
IfrsStatementLineItems [Line Items]    
Structured debt, amount contributed to fair value of plan assets 188 129
Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Equity securities 1,115  
International investments, amount contributed to fair value of plan assets 23 91
Total 5,988 4,496
Level 1 of fair value hierarchy [member] | Loans to corporate entities [member]    
IfrsStatementLineItems [Line Items]    
Debt instruments, amount contributed to fair value of plan assets 1 1
Level 1 of fair value hierarchy [member] | Governmental Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Debt instruments, amount contributed to fair value of plan assets 3,354 2,042
Level 1 of fair value hierarchy [member] | Fixed Income [Member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 1,040 1,910
Level 1 of fair value hierarchy [member] | Equity investments [member]    
IfrsStatementLineItems [Line Items]    
Investment funds, amount contributed to fair value of plan assets 455 452
Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Real estate, amount contributed to fair value of plan assets 293 212
Loans to participants, amount contributed to fair value of plan assets 128 106
Total 664 426
Level 3 of fair value hierarchy [member] | Ifrs Private Equity Funds [Member]    
IfrsStatementLineItems [Line Items]    
Structured debt, amount contributed to fair value of plan assets 240 103
Level 3 of fair value hierarchy [member] | Ifrs Real Estate Funds [Member]    
IfrsStatementLineItems [Line Items]    
Structured debt, amount contributed to fair value of plan assets $ 3 $ 5
[1] Financial investments not related to coverage of overfunded pension plans. Funds are related to the Company´s unconsolidated entities and former employees.