Borrowings - Schedule of Borrowings (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Jun. 30, 2018
Debt and Financial Instruments [Line Items]
Total borrowings	$ 1,857	$ 1,952
Less: current portion	(671)	(462)
Long-term borrowings	$ 1,186	1,490
Credit Facility 2013 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	3.63%
Due date	Apr. 07, 2019
Total	$ 217	222
Credit Facility 2014 Tranche 1 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	3.68%
Due date	May 30, 2019
Total	$ 144	148
Working Capital Facility 2017 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	3.98%
Due date	Jul. 03, 2020
Total	$ 58	59
Credit Facility 2014 Tranche 2 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	3.78%
Due date	Jan. 31, 2020
Total	$ 144	148
Credit Facility 2015 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	3.83%
Due date	Jul. 31, 2020
Total	$ 289	296
Credit Facility 2016 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	4.38%
Due date	Sep. 11, 2021
Total	$ 47	108
US Private Placement 2009 Tranche 3 [Member]
Debt and Financial Instruments [Line Items]
Interest rate	6.20%
Due date	Sep. 24, 2019
Total	$ 75	75
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	$ 149	150
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	$ 197	196
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	$ 147	146
US Private Placement 2012 AUD Portion [Member]
Debt and Financial Instruments [Line Items]
Interest rate	7.04%
Due date	Jul. 25, 2022
Total	$ 80	83
Credit Facility Fiscal 2016 Tranche 2 [Member] | REA Group Inc [Member]
Debt and Financial Instruments [Line Items]
Interest rate	2.84%
Due date	Dec. 31, 2018
Total	$ 86	89
Credit Facility Fiscal 2016 Tranche 3 [Member] | REA Group Inc [Member]
Debt and Financial Instruments [Line Items]
Interest rate	2.94%
Due date	Dec. 31, 2019
Total	$ 173	178
Credit Facility Fiscal 2018 [Member] | REA Group Inc [Member]
Debt and Financial Instruments [Line Items]
Interest rate	2.76%
Due date	Apr. 27, 2021
Total	$ 51	$ 54