Variable Interest Entities - VIEs of Which We Are Not the Primary Beneficiary (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012 Getrag Ford Transmissions GmbH [Member]	Jun. 30, 2012 Automotive [Member] Variable Interest Entity, Primary Beneficiary [Member] Getrag Deutsche Venture GmbH and Co KG [Member]	Jun. 30, 2012 Automotive [Member] Variable Interest Entity, Not Primary Beneficiary [Member]	Dec. 31, 2011 Automotive [Member] Variable Interest Entity, Not Primary Beneficiary [Member]	Jun. 30, 2012 Automotive [Member] Variable Interest Entity, Not Primary Beneficiary [Member] Zeledyne LLC [Member]	Jun. 30, 2012 Financial Services [Member] Variable Interest Entity, Not Primary Beneficiary [Member]	Dec. 31, 2011 Financial Services [Member] Variable Interest Entity, Not Primary Beneficiary [Member]	Jun. 30, 2012 Investments [Member] Automotive [Member] Variable Interest Entity, Not Primary Beneficiary [Member]	Dec. 31, 2011 Investments [Member] Automotive [Member] Variable Interest Entity, Not Primary Beneficiary [Member]	Jun. 30, 2012 Guarantees [Member] Automotive [Member] Variable Interest Entity, Not Primary Beneficiary [Member]	Dec. 31, 2011 Guarantees [Member] Automotive [Member] Variable Interest Entity, Not Primary Beneficiary [Member]
Percent ownership of VIE	50.00%	50.00%
Carrying value of obligation in VIE					$ 6
Total maximum exposure			212	235		74	71	206	229	6	6
Total change in maximum exposure			$ 23					$ 23		$ 0