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Implementation of IFRS16 Leases - impact of IFRS 16 on cash flows (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Cash flows provided by (used in) operating activities | $ 13,749 | $ 19,694 | $ 14,802
Cash flows provided by (used in) investing activities | (10,594) | (11,212) | (10,117)
Cash flows provided by (used in) financing activities | (5,497) | (5,024) | (5,822)
Net increase (decrease) in cash and cash equivalents | (2,341) | $ 3,458 | $ (1,137)
IAS 17 [member] |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Cash flows provided by (used in) operating activities | 13,062 |  |
Cash flows provided by (used in) investing activities | (11,003) |  |
Cash flows provided by (used in) financing activities | (4,400) |  |
Net increase (decrease) in cash and cash equivalents | (2,341) |  |
Difference [member] |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Cash flows provided by (used in) operating activities | 687 |  |
Cash flows provided by (used in) investing activities | 409 |  |
Cash flows provided by (used in) financing activities | (1,096) |  |
Net increase (decrease) in cash and cash equivalents | $ 0 |  |

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- Definition The cash flows from (used in) financing activities, which are activities that result in changes in the size and composition of the contributed equity and borrowings of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_10&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 50 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_50_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The cash flows from (used in) investing activities, which are the acquisition and disposal of long-term assets and other investments not included in cash equivalents. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_10&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 50 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_50_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The cash flows from (used in) operating activities, which are the principal revenue-producing activities of the entity and other activities that are not investing or financing activities. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_10&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 50 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_50_d&doctype=Standard -URIDate 2019-03-27 + Details
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