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Components of Lease Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]        
Operating lease cost $ 503 $ 478 $ 1,001 $ 943
Finance lease cost:        
Amortization of right-of-use assets 249 163 455 288
Interest on lease liabilities 94 84 186 162
Total finance lease cost $ 343 $ 247 $ 641 $ 450