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