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Financial instruments - additional disclosures (Details 2) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Contract or underlying principal amout [member] |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments | $ 8,043 | $ 13,347
Positive fair values [member] |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments | 204 | 105
Negative fair values [member] |  |
Disclosure of derivative financial instruments [line items] |  |
Derivative financial instruments | (55) | (68)
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 | 7,907 | 13,248
Derivative financial instruments, commodity purchase contract | 97 | 17
Derivative financial instruments, options on equity securities | 39 | 82
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 | 189 | 92
Derivative financial instruments, commodity purchase contract | 15 | 13
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 | (41) | (35)
Derivative financial instruments, options on equity securities | $ (14) | $ (33)

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