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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
Income Taxes [Line Items]
TCJA, adjustment to provisional net charge for income taxes			$ 157
Effective tax rate	16.00%	16.00%		16.00%	16.00%
Long-term income taxes	$ 28,888			$ 28,888		$ 29,612
Unrecognized Tax Benefits and Other Income Tax Liabilities
Income Taxes [Line Items]
Long-term income taxes	$ 16,100			$ 16,100		$ 15,300

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- Definition

Income Taxes [Line Items]

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income tax expense (benefit) for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act.

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