Additional Financial Information - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of year		$ (964)	$ (1,026)	$ (582)
Fiscal year activity		90	62	(444)
Balance, end of year		(874)	(964)	(1,026)
Unrealized Holding Gains (Losses) on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of year		(5)	20	19
Fiscal year activity	[1]	27	(25)	1
Balance, end of year		22	(5)	20
Cash Flow Hedge Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of year		0	0	0
Fiscal year activity	[2]	4	0	0
Balance, end of year		4	0	0
Benefit Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of year		(437)	(445)	(413)
Fiscal year activity	[3]	128	8	(32)
Balance, end of year		(309)	(437)	(445)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of year		(510)	(585)	(188)
Fiscal year activity	[4]	(81)	75	(397)
Balance, end of year		(591)	(510)	(585)
Share Of Other Comprehensive Income From Equity Affiliates Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of year		(12)	(16)	0
Fiscal year activity	[5]	12	4	(16)
Balance, end of year		$ 0	$ (12)	$ (16)

[1] Net of income tax expense (benefit) of $1 million, ($10) million and nil for the fiscal years ended June 30, 2018, 2017 and 2016, respectively.

[2] Net of income tax expense of $2 million, nil and nil for the fiscal years ended June 30, 2018, 2017 and 2016 respectively.

[3] Net of income tax expense (benefit) of $28 million, $8 million and ($14) million for the fiscal years ended June 30, 2018, 2017 and 2016, respectively.

[4] Excludes ($42) million, $9 million and ($1) million relating to noncontrolling interests for the fiscal years ended June 30, 2018, 2017 and 2016, respectively.

[5] Net of income tax expense (benefit) of $5 million, $2 million and ($7) million for the fiscal years ended June 30, 2018, 2017 and 2016, respectively.