Impact of Tax Cuts and Jobs Act on Previously Reported Balances of Prior Period Income Tax Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Jun. 30, 2017
Prior Period Adjustments Restatement [Line Items]
Long-term income taxes	$ 30,669	$ 13,485
Other long-term liabilities	$ 5,223	3,549
As Previously Reported
Prior Period Adjustments Restatement [Line Items]
Long-term income taxes		0
Other long-term liabilities		$ 17,034