Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 5,998	$ 6,001
Accumulated Amortization	2,520	2,283
Net Carrying Amount	3,478	3,718
Amortization expense	202	247	$ 278
Estimated amortization expense, 2020	160
Estimated amortization expense, 2021	160
Estimated amortization expense, 2022	160
Estimated amortization expense, 2023	160
Estimated amortization expense, 2024	160
Technology and intellectual property
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	734	734
Accumulated Amortization	533	457
Net Carrying Amount	201	277
Brands
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,298	4,299
Accumulated Amortization	1,285	1,165
Net Carrying Amount	3,013	3,134
Dealer network, customer relationships and other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	966	968
Accumulated Amortization	702	661
Net Carrying Amount	$ 264	$ 307