Lessor (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Revenue from sales type leases	$ 151	$ 200	$ 388	$ 484
Interest income on lease receivables	55	60	170	184
Lease income - operating leases	77	99	242	303
Variable lease income	15	25	51	80
Total Lease income	298	384	851	1,051
Profit at lease commencement, sales type leases	$ 52	$ 86	$ 138	$ 206