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Income Tax Expense - Summary of Income Tax Expense (Detail) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Major components of tax expense (income) [abstract]
Current tax expense	$ 2,414	$ 2,302	$ 5,052
Deferred tax (benefit)/expense	(56)	1,799	1,955
Total taxation expense	$ 2,358	$ 4,101	$ 7,007

- 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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