Balance Sheet Effect of Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Balance Sheet Effect of Derivative Instruments [Abstract]
Fair Value of Assets	$ 1,700
Automotive [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	24,558	22,635
Fair Value of Assets	160	218
Fair Value of Liabilities	749	820
Automotive [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	9,647	8,100
Fair Value of Assets	99	98
Fair Value of Liabilities	256	452
Automotive [Member] | Foreign currency exchange contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	7,777	5,692
Fair Value of Assets	76	92
Fair Value of Liabilities	96	80
Automotive [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	1,858	2,396
Fair Value of Assets	23	2
Fair Value of Liabilities	160	372
Automotive [Member] | Other - warrants [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	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]
Notional	14,911	14,535
Fair Value of Assets	61	120
Fair Value of Liabilities	493	368
Financial Services [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	82,982	85,494
Fair Value of Assets	1,501	1,375
Fair Value of Liabilities	400	299
Financial Services [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	68,551	77,708
Fair Value of Assets	681	849
Fair Value of Liabilities	395	299
Financial Services [Member] | Foreign currency exchange contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	2,723	3,582
Fair Value of Assets	6	30
Fair Value of Liabilities	33	50
Financial Services [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	63,214	70,639
Fair Value of Assets	675	670
Fair Value of Liabilities	279	237
Financial Services [Member] | Cross-currency interest rate swap contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	2,614	987
Fair Value of Assets		12
Fair Value of Liabilities	83	12
Financial Services [Member] | Other [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	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]
Notional	14,431	7,786
Fair Value of Assets	820	526
Fair Value of Liabilities	$ 5	$ 0