COMPREHENSIVE INCOME STATEMENTS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (6,302)	$ 6,267	$ 274	$ 11,934
Other comprehensive income (loss), net of tax:
Net change related to derivatives	(7)	280	(113)	243
Net change related to investments	(878)	(994)	(1,166)	(911)
Translation adjustments and other	(40)	(592)	253	(474)
Other comprehensive loss	(925)	(1,306)	(1,026)	(1,142)
Comprehensive income (loss)	$ (7,227)	$ 4,961	$ (752)	$ 10,792