Finance Assets, Net Schedule of PMCC Leveraged Lease (Benefit) Charge (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Decrease in Financial Services Net Revenues and OCI	$ 7	$ 490	$ 7	$ 490
Portion Of Charge Recorded As (Benefit) Provision For Income Taxes	(75)	137	(75)	137
Leveraged Lease (Benefit) Charge	(68)	627	(68)	627
Reduction To Cumulative Lease Earnings [Member]
Decrease in Financial Services Net Revenues and OCI	7	490	7	490
Portion Of Charge Recorded As (Benefit) Provision For Income Taxes	(2)	(175)	(2)	(175)
Leveraged Lease (Benefit) Charge	5	315	5	315
Interest On Tax Underpayments [Member]
Decrease in Financial Services Net Revenues and OCI	0	0	0	0
Portion Of Charge Recorded As (Benefit) Provision For Income Taxes	(73)	312	(73)	312
Leveraged Lease (Benefit) Charge	$ (73)	$ 312	$ (73)	$ 312