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New Standards and Interpretations Adopted in the Current Year - Summary of impact of transition to IFRS 16 (Detail) - I F R S16 [Member] - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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Disclosure of detailed information about financial instruments [line items] |  |  |
Lease liabilities |  | $ 1,292 | $ 1,717
Leases expiring in 12 months or fewer | $ 108 |  |
Lease commitments, not commenced | $ 119 |  |
Previously stated [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Lease liabilities |  |  | 1,717
Increase (decrease) due to changes in accounting policy required by IFRSs [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Lease liabilities |  |  | 1,712
Leases expiring in 12 months or fewer |  |  | (130)
Lease commitments, not commenced |  |  | (133)
Lease Components excluded from Lease Liability |  |  | (169)
Lease, Cost Of Extensions |  | $ 324 |
Lease, Costs, Other |  |  | 103
Undiscounted finance lease payments to be received |  |  | $ (420)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of the lease commitments for short-term leases accounted for applying paragraph 6 of IFRS 16. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of undiscounted finance lease payments to be received. Finance lease is a lease that transfers substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 94 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_94&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Lease Commitments, Not commenced + References No definition available. + Details
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- Definition Lease Components excluded from Lease Liability + References No definition available. + Details
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- Definition Lease, Cost Of Extensions + References No definition available. + Details
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- Definition Lease, Costs, Other + References No definition available. + Details
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- Details
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