Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Information [Line Items]
Revenues	$ 36,451	$ 35,943	$ 115,450	$ 113,146
Pre-tax results - income/(loss)	1,757	1,387	6,259	7,913
Equity in net income/(loss) of affiliated companies	316	403	935	1,342
Cash, cash equivalents, and marketable securities	38,081	34,165	38,081	34,165
Total assets	251,273	234,963	251,273	234,963	$ 237,951
Debt	149,112	137,224	149,112	137,224
Operating cash flows	4,998	5,161	14,949	17,052
Automotive capital spending			4,936	4,912
Settlement of derivatives			(62)	(330)
Special Items [Member]
Segment Information [Line Items]
Revenues			0	0
Pre-tax results - income/(loss)	(217)	(26)	(441)	(330)
Equity in net income/(loss) of affiliated companies			0	0
Operating cash flows			0	0
Adjustments [Member]
Segment Information [Line Items]
Revenues			0	0
Pre-tax results - income/(loss)			0	0
Equity in net income/(loss) of affiliated companies			0	0
Total assets	(6,959)	(5,352)	(6,959)	(5,352)
Operating cash flows	1,481	1,162	3,943	3,374
Automotive capital spending	1,659	1,696	4,901	4,879
Settlement of derivatives	90	(246)	(110)	(322)
Funded pension contributions	(264)	(246)	(720)	(835)
Other	37	(2)	$ (28)	(150)
Operating Segments [Member] | Automotive
Segment Information [Line Items]
Number of Regional Business Units			5
Revenues	33,646	33,331	$ 107,234	105,520
Pre-tax results - income/(loss)	1,668	1,084	5,824	7,380
Equity in net income/(loss) of affiliated companies	305	395	910	1,319
Cash, cash equivalents, and marketable securities	26,144	24,300	26,144	24,300
Total assets	103,534	97,269	103,534	97,269
Debt	16,184	13,147	16,184	13,147	15,907
Operating cash flows	(1,654)	(1,954)	1,632	4,917
Operating Segments [Member] | Financial Services
Segment Information [Line Items]
Revenues	2,802	2,612	8,209	7,626
Pre-tax results - income/(loss)	584	552	1,653	1,436
Equity in net income/(loss) of affiliated companies	10	8	25	23
Cash, cash equivalents, and marketable securities	11,936	9,855	11,936	9,855
Total assets	154,613	142,979	154,613	142,979
Debt	132,928	124,077	132,928	124,077	$ 127,063
Operating cash flows	5,193	5,953	$ 9,418	8,761
Operating Segments [Member] | All Other
Segment Information [Line Items]
Number of Operating Segments			2
Revenues	3		$ 7	0
Pre-tax results - income/(loss)	(278)	(223)	(777)	(573)
Equity in net income/(loss) of affiliated companies	1		0	0
Cash, cash equivalents, and marketable securities	1	10	1	10
Total assets	85	67	85	67
Operating cash flows	(22)		(44)	0
Employee Severance [Member] | Adjustments [Member]
Segment Information [Line Items]
Separation payments	$ (41)	$ (40)	$ (100)	$ (198)