Balance Sheet Effect of Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Balance Sheet Effect of Derivative Instruments [Abstract]
Fair Value of Assets	$ 1,400
Automotive [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	25,900	28,742
Fair Value of Assets	560	241
Fair Value of Liabilities	410	610
Automotive [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	8,911	11,079
Fair Value of Assets	125	91
Fair Value of Liabilities	149	253
Automotive [Member] | Foreign currency exchange contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	6,759	9,225
Fair Value of Assets	113	68
Fair Value of Liabilities	67	129
Automotive [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	2,152	1,854
Fair Value of Assets	12	23
Fair Value of Liabilities	82	124
Automotive [Member] | Cash Flow Hedging [Member] | Foreign currency exchange contracts [Member] | Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	16,989	17,663
Fair Value of Assets	435	150
Fair Value of Liabilities	261	357
Financial Services [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	87,420	91,057
Fair Value of Assets	818	1,300
Fair Value of Liabilities	386	381
Financial Services [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	68,105	74,303
Fair Value of Assets	384	513
Fair Value of Liabilities	218	373
Financial Services [Member] | Foreign currency exchange contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	2,023	2,378
Fair Value of Assets	14	9
Fair Value of Liabilities	12	8
Financial Services [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	62,963	68,919
Fair Value of Assets	344	504
Fair Value of Liabilities	148	248
Financial Services [Member] | Cross-currency interest rate swap contracts [Member] | Not Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	3,119	3,006
Fair Value of Assets	26	0
Fair Value of Liabilities	58	117
Financial Services [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member]
Balance Sheet Effect of Derivative Instruments [Abstract]
Notional	19,315	16,754
Fair Value of Assets	434	787
Fair Value of Liabilities	$ 168	$ 8