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v3.20.1

Implementation of IFRS16 Leases - maturity profile, based on undiscounted cash flows (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | $ 43,012 | $ 42,562
Lease liabilities [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 5,267 |
2019 [member] | Lease liabilities [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,133 |
2020-2021 [member] | Lease liabilities [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,655 |
2022-2023 [member] | Lease liabilities [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 921 |
2024-2028 [Member] | Lease liabilities [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,086 |
After 2028 [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 10,567 | $ 9,570
After 2028 [member] | Lease liabilities [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | $ 472 |

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- Definition The amount of contractual undiscounted cash flows in relation to non-derivative financial liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 39 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_39_a&doctype=Standard -URIDate 2019-03-27 + Details
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