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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]        
Intangible assets amortization expense $ 378 $ 411 $ 761 $ 845