Lessor - Components of Lease Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Economic life of leased product	5 years
Revenue from sales type leases	$ 573	$ 672
Revenue from sales type leases			$ 699
Interest income on lease receivables	226	244
Interest income on lease receivables			268
Lease income - operating leases	313	396
Lease income - operating leases			438
Variable lease income	66	107
Variable lease income			120
Total Lease income	1,178	1,419
Total Lease income			1,525
Profit at lease commencement, sales type leases	$ 207	$ 276
Profit at lease commencement, sales type leases			$ 302