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Financial and capital risk management - Financial counterparties' ratings (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Cash and cash equivalents |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | $ 14,600 | $ 14,258
Cash and cash equivalents | Aa1 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 94 | 2,210
Cash and cash equivalents | Aa2 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 384 | 363
Cash and cash equivalents | Aa3 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 603 | 1,681
Cash and cash equivalents | A1 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 4,124 | 2,812
Cash and cash equivalents | A2 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 4,429 | 4
Cash and cash equivalents | A3 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 1,034 | 5
Cash and cash equivalents | Baa1 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure |  | 4
Cash and cash equivalents | Baa2 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 19 | 1
Cash and cash equivalents | Ba1 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure |  | 2,986
Cash and cash equivalents | Ba2 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 2,551 | 4,189
Cash and cash equivalents | Ba3 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 1,279 |
Cash and cash equivalents | Others |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 83 | 3
Derivatives |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 422 | 200
Derivatives | Aa1 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure |  | 36
Derivatives | Aa2 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 13 | 15
Derivatives | Aa3 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 41 | 41
Derivatives | A1 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 20 | 21
Derivatives | A2 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 130 | 20
Derivatives | A3 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 67 | 36
Derivatives | Ba1 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 35 |
Derivatives | Ba2 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 51 | 6
Derivatives | Ba3 |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | 13 |
Derivatives | Others |  |
Disclosure of external credit grades [line items] |  |
Credit exposure | $ 52 | $ 25

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