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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
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

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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

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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

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- Definition

Lease Commitments, Not commenced

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- Definition

Lease Components excluded from Lease Liability

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- Definition

Lease, Cost Of Extensions

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- Definition

Lease, Costs, Other

+ References

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