Leases - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Amount of extension of lease term	5 years
Carrying amount of residual assets covered by residual value guarantees	$ 289
Carrying amount of operating lease assets	$ 941
Leases, Excluding Ground Leases [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, lease term of operating or financing leases	1 year
Leases, Excluding Ground Leases [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, lease term of operating or financing leases	20 years
Ground Leases [Member]
Lessee, Lease, Description [Line Items]
Lessee, lease term of operating or financing leases	30 years