Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Information [Line Items]
Revenues	$ 39,853	$ 39,485	$ 78,999	$ 77,203
Pre-tax results - income/(loss)	2,259	2,875	4,502	6,526
Equity in net income/(loss) of affiliated companies	273	398	619	939
Cash, cash equivalents, and marketable securities	39,109	39,297	39,109	39,297
Total assets	247,469	239,678	247,469	239,678	$ 237,951
Debt	146,009	139,914	146,009	139,914
Operating cash flows	5,615	7,742	9,951	11,891
Automotive capital spending			3,264	3,206
Net cash flows from non-designated derivatives			(154)	(111)
Special Items [Member]
Segment Information [Line Items]
Revenues			0	0
Pre-tax results - income/(loss)	(248)	(118)	(224)	(304)
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	(6,990)	(4,903)	(6,990)	(4,903)
Operating cash flows	1,216	1,315	2,462	2,212
Automotive capital spending	1,547	1,686	3,242	3,183
Net cash flows from non-designated derivatives	(66)	41	(200)	(76)
Funded pension contributions	(221)	(221)	(456)	(589)
Other	(13)	(43)	$ (65)	(148)
Operating Segments [Member] | Automotive
Segment Information [Line Items]
Number of Regional Business Units			5
Revenues	37,113	36,932	$ 73,588	72,189
Pre-tax results - income/(loss)	2,191	2,832	4,156	6,296
Equity in net income/(loss) of affiliated companies	266	390	605	924
Cash, cash equivalents, and marketable securities	28,428	27,210	28,428	27,210
Total assets	103,583	99,272	103,583	99,272
Debt	16,188	13,071	16,188	13,071	15,907
Operating cash flows	1,270	4,144	3,286	6,871
Operating Segments [Member] | Financial Services
Segment Information [Line Items]
Revenues	2,738	2,553	5,407	5,014
Pre-tax results - income/(loss)	603	385	1,069	884
Equity in net income/(loss) of affiliated companies	8	8	15	15
Cash, cash equivalents, and marketable securities	10,677	12,087	10,677	12,087
Total assets	150,793	145,303	150,793	145,303
Debt	129,821	126,843	129,821	126,843	$ 127,063
Operating cash flows	3,152	2,283	$ 4,236	2,808
Operating Segments [Member] | All Other
Segment Information [Line Items]
Number of Operating Segments			2
Revenues	2		$ 4	0
Pre-tax results - income/(loss)	(287)	(224)	(499)	(350)
Equity in net income/(loss) of affiliated companies	(1)		(1)	0
Cash, cash equivalents, and marketable securities	4		4
Total assets	83	6	83	6
Operating cash flows	(23)		(33)	0
Employee Severance [Member] | Adjustments [Member]
Segment Information [Line Items]
Separation payments	$ (31)	$ (148)	$ (59)	$ (158)