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Income taxes - Effective Consolidated Income Tax Rates (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Major components of tax expense (income) [abstract]
Earnings before income tax	$ (1,274)	$ 253	$ 717
Income tax	$ (52)	$ (162)	$ (224)
Effective consolidated income tax expense rate	(4.10%)	64.00%	31.20%

- Definition

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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