Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Jul. 01, 2018	Jun. 30, 2018
Significant Accounting Policies [Line Items]
Long-term accounts receivable, net of allowance for doubtful accounts	$ 1,800		$ 1,800
Retained earnings	17,279		13,682
Long-term deferred tax liabilities	1,977		541
Other current assets	$ 7,311		$ 6,751
Accounting Standards Update 2016-16
Significant Accounting Policies [Line Items]
Retained earnings		$ 557
Long-term deferred tax assets		2,800
Long-term deferred tax liabilities		2,100
Other current assets		$ (152)