Leases - Schedule of Contractual Future Lease Obligations (Detail) $ in Millions	Jun. 30, 2019 USD ($)
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
Operating leases, One year or Less	$ 287
Operating leases, Over One Through Two Years	263
Operating leases, Over Two Through Three Years	226
Operating leases, Over Three Through Four Years	186
Operating leases, Over Four Through Five Years	143
Operating leases, Thereafter	442
Operating leases	1,547
Operating leases, amounts representing interest	(166)
Operating leases, lease liabilities	1,381
Finance leases, One Year or Less	17
Finance leases, Over One Through Two Years	15
Finance leases, Over Two Through Three Years	12
Finance leases, Over Three Through Four Years	10
Finance leases, Over Four Through Five Years	10
Finance leases, thereafter	34
Finance leases	98
Finance leases, Amounts representing interest	(33)
Finance leases, lease liabilities	$ 65