Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Reserve for estimated credit losses on lease payment receivables	$ 62	$ 64
Net investment leases	$ 238	$ 237
Minimum
Lessee, Lease, Description [Line Items]
Lessor lease term (in months and years)	1 month
Maximum
Lessee, Lease, Description [Line Items]
Lessor lease term (in months and years)	5 years