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Gains (Losses), Net of Tax, on Derivative Instruments Recognized on Consolidated Comprehensive Income Statements (Detail) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash Flow Hedges | Foreign Exchange Contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Included in effectiveness assessment $ 20 $ (6)