Leases - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease not yet commenced	$ 7,310
Finance lease not yet commenced	$ 398
Minimum
Lessee, Lease, Description [Line Items]
Lease not yet commenced, term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease not yet commenced, term	30 years