Lessor - Components of Lease Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Revenue from sales type leases	$ 111	$ 150	$ 237	$ 284
Interest income on lease receivables	56	61	115	124
Lease income - operating leases	79	100	165	204
Variable lease income	14	28	36	55
Total Lease income	260	339	553	667
Profit at lease commencement, sales type leases	$ 42	$ 55	$ 86	$ 120