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Financial instruments - additional disclosures (Details 4) - Contract or underlying principal amout [member] - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments | $ 13,760 | $ 11,057
EUR |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments | 2,432 | 1,373
USD |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments | 6,457 | 8,019
Others |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments | 4,871 | 1,665
Derivative financial instruments, at fair value currency related [member] |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments, forward foreign exchange rate contracts | 13,679 | 10,779
Derivative financial instruments, commodity purchase contract | 11 | 9
Derivative financial instruments, options on equity securities | 70 | 269
Derivative financial instruments, at fair value currency related [member] | EUR |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments, forward foreign exchange rate contracts | 2,432 | 1,373
Derivative financial instruments, at fair value currency related [member] | USD |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments, forward foreign exchange rate contracts | 6,376 | 7,760
Derivative financial instruments, commodity purchase contract | 11 | 9
Derivative financial instruments, options on equity securities | 70 | 250
Derivative financial instruments, at fair value currency related [member] | Others |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments, forward foreign exchange rate contracts | $ 4,871 | 1,646
Derivative financial instruments, options on equity securities |  | $ 19

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