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Financial instruments - additional disclosures (Details 3) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Contract or underlying principal amout [member] |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments | $ 13,760 | $ 11,057
Positive fair values [member] |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments | 159 | 102
Negative fair values [member] |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments | (194) | (185)
Derivative financial instruments, at fair value currency related [member] | Contract or underlying principal amout [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] | Positive fair values [member] |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments, forward foreign exchange rate contracts | 151 | 96
Derivative financial instruments, commodity purchase contract | 8 | 6
Derivative financial instruments, at fair value currency related [member] | Negative fair values [member] |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments, forward foreign exchange rate contracts | (165) | (75)
Derivative financial instruments, options on equity securities | $ (29) | $ (110)

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