Leases (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating and financing lease, renewal term, maximum	99 years
Operating lease asset	$ 2,000
Operating lease liability	$ 2,157
Minimum [Member]
Lessee, Lease, Description [Line Items]
Operating and finance lease, lease term	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Operating and finance lease, lease term	62 years