Lessor (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Revenue from sales type leases	$ 189	$ 111	$ 336	$ 237
Interest income on lease receivables	56	56	111	115
Lease income - operating leases	58	79	118	165
Variable lease income	16	14	31	36
Total Lease income	319	260	596	553
Profit at lease commencement, sales type leases	$ 57	$ 42	$ 101	$ 86