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Supplemental Cash Flow Information Related to Leases (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Cash paid for amounts included in the measurement of lease liabilities:        
Operating cash flows from operating leases $ 479 $ 407 $ 932 $ 804
Operating cash flows from finance leases 84 59 162 114
Financing cash flows from finance leases 104 54 183 101
Right-of-use assets obtained in exchange for lease obligations:        
Operating leases 948 472 1,931 968
Finance leases $ 863 $ 645 $ 2,352 $ 1,064