Leases - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease not yet commenced	$ 5,070
Finance lease not yet commenced	$ 332
Minimum
Lessee, Lease, Description [Line Items]
Lease not yet commenced, term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease not yet commenced, term	25 years