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Other commitments, contingent liabilities and contingent assets - long-term commitments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Contractual and other long term commitments $ 11,725
2021 [member]  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Contractual and other long term commitments 2,144
2022 [member]  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Contractual and other long term commitments 2,057
2023 [member]  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Contractual and other long term commitments 1,631
2024 [member]  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Contractual and other long term commitments 1,296
2025 [member]  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Contractual and other long term commitments 1,233
Thereafter [member]  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Contractual and other long term commitments $ 3,364