Borrowings - Schedule of Borrowings (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Debt and Financial Instruments [Line Items]
Total borrowings	$ 1,952,000,000	$ 379,000,000
Less: current portion	(462,000,000)	(103,000,000)
Long-term borrowings	$ 1,490,000,000	276,000,000
Credit Facility 2013 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	3.86%
Due date	Apr. 07, 2019
Total	$ 222	0
Credit Facility 2014 Tranche 1 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	3.86%
Due date	May 30, 2019
Total	$ 148	0
Working Capital Facility 2017 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	4.16%
Due date	Jul. 03, 2020
Total	$ 59	0
Credit Facility 2014 Tranche 2 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	3.96%
Due date	Jan. 31, 2020
Total	$ 148	0
Credit Facility 2015 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	4.01%
Due date	Jul. 31, 2020
Total	$ 296	0
Credit Facility 2016 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	4.56%
Due date	Sep. 11, 2021
Total	$ 108	0
US Private Placement 2009 Tranche 3 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	6.20%
Due date	Sep. 24, 2019
Total	$ 75	0
US Private Placement 2012 USD Portion Tranche 1 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	3.68%
Due date	Jul. 25, 2019
Total	$ 150	0
US Private Placement 2012 USD Portion Tranche 2 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	4.27%
Due date	Jul. 25, 2022
Total	$ 196	0
US Private Placement 2012 USD Portion Tranche 3 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	4.42%
Due date	Jul. 25, 2024
Total	$ 146	0
US Private Placement 2012 AUD Portion [Member]
Debt and Financial Instruments [Line Items]
Interest rate	7.04%
Due date	Jul. 25, 2022
Total	$ 83	0
Credit Facility Fiscal 2016 Tranche1 [Member] | REA Group [Member]
Debt and Financial Instruments [Line Items]
Interest rate	0.00%
Due date	Dec. 31, 2017
Total	$ 0	92
Credit Facility Fiscal 2016 Tranche 2 [Member] | REA Group [Member]
Debt and Financial Instruments [Line Items]
Interest rate	3.11%
Due date	Dec. 31, 2018
Total	$ 89	92
Credit Facility Fiscal 2016 Tranche 3 [Member] | REA Group [Member]
Debt and Financial Instruments [Line Items]
Interest rate	3.21%
Due date	Dec. 31, 2019
Total	$ 178	184
Credit Facility Fiscal 2018 [Member] | REA Group [Member]
Debt and Financial Instruments [Line Items]
Interest rate	3.01%
Due date	Apr. 27, 2021
Total	$ 54	0
Other Obligations [Member]
Debt and Financial Instruments [Line Items]
Due date	Feb. 02, 2018
Total	$ 0	$ 11