Balance Sheet Effect of Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Balance Sheet Effect of Derivative Instruments [Abstract]
Fair Value of Assets	$ 1,500
Automotive [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notionals	23,508	22,635
Fair Value of Assets	131	218
Fair Value of Liabilities	910	820
Automotive [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notionals	7,791	8,100
Fair Value of Assets	69	98
Fair Value of Liabilities	408	452
Automotive [Member] | Foreign currency exchange contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notionals	5,746	5,692
Fair Value of Assets	66	92
Fair Value of Liabilities	73	80
Automotive [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notionals	2,033	2,396
Fair Value of Assets	3	2
Fair Value of Liabilities	335	372
Automotive [Member] | Other - warrants [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notionals	12	12
Fair Value of Assets		4
Fair Value of Liabilities		0
Automotive [Member] | Cash Flow Hedging [Member] | Foreign currency exchange contracts [Member] | Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notionals	15,717	14,535
Fair Value of Assets	62	120
Fair Value of Liabilities	502	368
Financial Services [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notionals	78,113	85,494
Fair Value of Assets	1,336	1,375
Fair Value of Liabilities	299	299
Financial Services [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notionals	65,320	77,708
Fair Value of Assets	628	849
Fair Value of Liabilities	299	299
Financial Services [Member] | Foreign currency exchange contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notionals	2,452	3,582
Fair Value of Assets	15	30
Fair Value of Liabilities	13	50
Financial Services [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notionals	60,289	70,639
Fair Value of Assets	608	670
Fair Value of Liabilities	254	237
Financial Services [Member] | Cross-currency interest rate swap contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notionals	2,579	987
Fair Value of Assets	5	12
Fair Value of Liabilities	32	12
Financial Services [Member] | Other [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notionals	0	2,500
Fair Value of Assets	0	137
Fair Value of Liabilities	0	0
Financial Services [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notionals	12,793	7,786
Fair Value of Assets	708	526
Fair Value of Liabilities		$ 0