Leases - Components of Equipment Leasing Income (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Sales-type and direct financing leases
Interest income on lease receivable	$ 30
Interest income related to accretion of unguaranteed residual asset	3
Interest income on deferred fees and costs	0
Total sales-type and direct financing lease income	33
Operating leases
Operating lease income related to lease payments	33
Other operating leasing gains	4
Total operating lease income and other leasing gains	37
Total lease income	$ 70