v3.8.0.1
Maturities of lease liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Jun. 30, 2017
Leases [Abstract]    
Operating Leases, Year Ending June 30, 2018 (excluding the nine months ended March 31, 2018) $ 388  
Operating Leases, Year Ending June 30, 2019 1,472  
Operating Leases, Year Ending June 30, 2020 1,340  
Operating Leases, Year Ending June 30, 2021 1,076  
Operating Leases, Year Ending June 30, 2022 887  
Operating Leases, Thereafter 2,790  
Operating Leases, Total lease payments 7,953  
Operating Leases, Less imputed interest (820)  
Operating Leases 7,133 $ 6,795
Finance Leases, Year Ending June 30, 2018 (excluding the nine months ended March 31, 2018) 104  
Finance Leases, Year Ending June 30, 2019 384  
Finance Leases, Year Ending June 30, 2020 391  
Finance Leases, Year Ending June 30, 2021 399  
Finance Leases, Year Ending June 30, 2022 406  
Finance Leases, Thereafter 4,442  
Finance Leases, Total lease payments 6,126  
Finance Leases, Less imputed interest (1,795)  
Finance Leases $ 4,331 $ 2,538