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Maturities of Long-term Debt Including Current Portion (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Jun. 30, 2020
Debt Disclosure [Abstract]    
Year Ending June 30, 2021 (excluding the six months ended December 31, 2020) $ 500  
Year Ending June 30, 2022 8,141  
Year Ending June 30, 2023 2,750  
Year Ending June 30, 2024 5,250  
Year Ending June 30, 2025 2,250  
Thereafter 45,672  
Total $ 64,563 $ 67,407