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Net operating costs (excluding items shown separately) - Summary of net operating costs (excluding items shown separately) (Footnotes (Detail) £ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 GBP (£)
Disclosure Of Operating Costs [Line Items]
Operating lease expenses		$ 787.0	$ 555.0
Purchases of the other investors' share of production	$ 291.0	332.0	229.0
Payments for low value leases (12 months in duration)	(1.0)
Short-term lease costs	327.0
Payments for variable lease components	15.0
Pre-tax gains on disposals of property, plant and equipment	$ 49.0	586.0	138.0
United Kingdoms Financial Conduct Authority (FCA) [Member]
Disclosure Of Operating Costs [Line Items]
Financial penalty			$ 36.4	£ 27.4
Kitimat [Member]
Disclosure Of Operating Costs [Line Items]
Pre-tax gains on disposals of property, plant and equipment		$ 549.0

X

- Definition

The amount of the expense relating to leases of low-value assets accounted for applying paragraph 6 of IFRS 16. This expense shall not include the expense relating to short-term leases of low-value assets.

+ References

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The amount of the expense relating to short-term leases accounted for applying paragraph 6 of IFRS 16. This expense need not include the expense relating to leases with a lease term of one month or less. 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

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+ References

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- Definition

The gain on the disposal of property, plant and equipment. [Refer: Property, plant and equipment]

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Operating lease expenses.

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Purchases of other investors share of production accounted for using equity method investment.

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