Lessor (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Revenue from sales type leases	$ 170	$ 151	$ 506	$ 388
Interest income on lease receivables	55	55	166	170
Lease income - operating leases	54	77	172	242
Variable lease income	15	15	46	51
Total Lease income	294	298	890	851
Profit at lease commencement, sales type leases	$ 51	$ 52	$ 152	$ 138