Supplemental Cash Flow Information (Supplemental Cash Flow Disclosure Related To Leases) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2019	Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]
Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases	$ 1,108	$ 2,028
Right-of-use assets obtained in exchange for lease obligations: Operating leases	$ 2,260	$ 2,490