Leases - Narrative (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Jan. 01, 2020
Lessee, Lease, Description [Line Items]
Net investment leases	$ 233
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member
Minimum
Lessee, Lease, Description [Line Items]
Lessee lease term	1 year
Lessor lease term	2 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee lease term	18 years
Lessor lease term	5 years
Cumulative Effect, Period of Adoption, Adjustment
Lessee, Lease, Description [Line Items]
Reserve for estimated credit losses on lease payment receivables	$ 60		$ 56