Balance Sheet Effect of Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 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]
Notional	28,742	22,635
Fair Value of Assets	241	218
Fair Value of Liabilities	610	820
Automotive [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	11,079	8,100
Fair Value of Assets	91	98
Fair Value of Liabilities	253	452
Automotive [Member] | Foreign currency exchange contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	9,225	5,692
Fair Value of Assets	68	92
Fair Value of Liabilities	129	80
Automotive [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	1,854	2,396
Fair Value of Assets	23	2
Fair Value of Liabilities	124	372
Automotive [Member] | Other - warrants [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional		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	17,663	14,535
Fair Value of Assets	150	120
Fair Value of Liabilities	357	368
Financial Services [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	91,057	85,494
Fair Value of Assets	1,300	1,375
Fair Value of Liabilities	381	299
Financial Services [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	74,303	77,708
Fair Value of Assets	513	849
Fair Value of Liabilities	373	299
Financial Services [Member] | Foreign currency exchange contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	2,378	3,582
Fair Value of Assets	9	30
Fair Value of Liabilities	8	50
Financial Services [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	68,919	70,639
Fair Value of Assets	504	670
Fair Value of Liabilities	248	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	3,006	987
Fair Value of Assets		12
Fair Value of Liabilities	117	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	16,754	7,786
Fair Value of Assets	787	526
Fair Value of Liabilities	$ 8	$ 0