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Provisions, including post-retirement benefits - Summary of Provisions, including post-retirement benefits (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of other provisions [Line Items] |  |  |
Remaining lives of operations and infrastructure | one to over 60 years |  |
Remaining lives of operations and infrastructure present closure obligation | 18 years | P17Y |
Provision for carrying value close-down, restoration and environmental |  | $ 9,975 |
Risk free interest rate on provisions | 2.00% |  |
Provisions | $ 15,103 | 13,608 | $ 14,642
Non-current provisions | $ 13,704 | 12,552 |
Bottom of range [member] |  |  |
Disclosure of other provisions [Line Items] |  |  |
Risk free interest rate on provisions | 0.50% |  |
Top of range [member] |  |  |
Disclosure of other provisions [Line Items] |  |  |
Provisions | $ 979 |  |
Other employee entitlements [member] |  |  |
Disclosure of other provisions [Line Items] |  |  |
Provision for long service leave | 248 | 242 |
Provision for redundancy and severance payments | 30 | 46 |
Provisions | 354 | 360 |
Non-current provisions | 94 |  |
Close down and restoration/ environmental [member] |  |  |
Disclosure of other provisions [Line Items] |  |  |
Provisions | 11,090 | 9,975 |
Non-current provisions | 10,549 |  |
Provisions relating to insurance recoveries and other financial assets held | 113 | 110 |
Close down and restoration/ environmental [member] | Between 1 and 5 years [member] |  |  |
Disclosure of other provisions [Line Items] |  |  |
Non-current provisions | 382 | 535 |
Close down and restoration/ environmental [member] | More than 5 years [member] |  |  |
Disclosure of other provisions [Line Items] |  |  |
Non-current provisions | $ 883 | $ 683 |

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- Definition The amount of non-current provisions. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_l&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of provision for costs related to decommissioning, restoration and rehabilitation. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2019-01-01 -Section D Examples: disclosures -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_D_TI -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2019-01-01 -Paragraph 87 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_87&doctype=Standard -URIDate 2019-03-27 + Details
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