Investments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Schedule of Investments [Abstract]
Equity losses of affiliates	$ 7	$ 4	$ 12	$ 13

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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