Leases - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jul. 29, 2020
Lessee, Lease, Description [Line Items]
Operating lease not yet commenced	$ 4,910
Finance lease not yet commenced	364
Non-cancelable contractual commitments	$ 8,300
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
Subsequent Event
Lessee, Lease, Description [Line Items]
Non-cancelable contractual commitments		$ 1,000