New Accounting Standards New Accounting Standards - Cumulative Effect of changes due to Adoption of ASU 2014-09 and 2016-09 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2017
ASSETS
Trade and other receivables, less allowances of $392 and $412	$ 10,599	$ 11,102		$ 11,085
Inventories (Note 12)	10,277	8,898		8,889
Other assets	3,889	3,368		3,675
Net investment in operating leases	28,235	28,829		27,751
Deferred income taxes (Note 7)	10,973	9,705		10,228
LIABILITIES
Payables	23,282	21,296		21,558
Other liabilities and deferred revenue (Note 16)	19,697	19,316		17,887
Other liabilities and deferred revenue (Note 16)	24,711	24,395		24,390
Equity [Abstract]
Capital in excess of par value of stock	21,843	21,630		21,636
Retained earnings	21,218	15,634		16,200
Difference Between Share Based Compensation Guidance in Effect before and after Topic 718 [Member] | Accounting Standards Update 2016-09 [Member]
ASSETS
Trade and other receivables, less allowances of $392 and $412				0
Inventories (Note 12)				0
Other assets				0
Net investment in operating leases				0
Deferred income taxes (Note 7)				536
LIABILITIES
Payables				0
Other liabilities and deferred revenue (Note 16)				0
Other liabilities and deferred revenue (Note 16)				0
Equity [Abstract]
Capital in excess of par value of stock				6
Retained earnings				530
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
ASSETS
Trade and other receivables, less allowances of $392 and $412	(43)			(17)
Inventories (Note 12)				(9)
Other assets	351			307
Net investment in operating leases	(786)			(1,078)
Deferred income taxes (Note 7)	(6)			(13)
LIABILITIES
Payables	283			262
Other liabilities and deferred revenue (Note 16)	(1,182)			(1,429)
Other liabilities and deferred revenue (Note 16)	(5)			(5)
Equity [Abstract]
Capital in excess of par value of stock				0
Retained earnings	35			36
Reclassified from Operating to Financing Activities on Statement of Cash Flow for Share Based Compensation Guidance in Effect before and after Topic 718 [Member] | Accounting Standards Update 2016-09 [Member]
Statement of Cash Flows [Abstract]
Payments Related to Tax Withholding for Share-based Compensation	57	58	$ 56
Automotive | Operating Segments [Member]
LIABILITIES
Debt, Current	3,356	$ 2,685		3,011
Automotive | Operating Segments [Member] | Difference Between Share Based Compensation Guidance in Effect before and after Topic 718 [Member] | Accounting Standards Update 2016-09 [Member]
LIABILITIES
Debt, Current				0
Automotive | Operating Segments [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
LIABILITIES
Debt, Current	$ 385			$ 326