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Components of Lease Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Leases [Abstract]        
Operating lease cost $ 469 $ 503 $ 1,057 $ 1,001
Finance lease cost:        
Amortization of right-of-use assets 264 249 490 455
Interest on lease liabilities 107 94 211 186
Total finance lease cost $ 371 $ 343 $ 701 $ 641