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Discontinued Operations - Summary of Cash Flows from Discontinued Operations (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Cash flows from continuing and discontinued operations [abstract]      
Net operating cash flows $ 900 $ 928 $ 785
Net investing cash flows (861) (437) (1,227)
Net financing cash flows (40) (28) (32)
Net (decrease)/increase in cash and cash equivalents from Discontinued operations $ (1) $ 463 $ (474)