Finance Assets, net (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	51 Months Ended				3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009	Jun. 30, 2011 Reduction to Cumulative Lease Earnings [Member]	Jun. 30, 2011 Reduction to Cumulative Lease Earnings [Member]	Jun. 30, 2011 Interest on Tax Underpayments [Member]	Jun. 30, 2011 Interest on Tax Underpayments [Member]	Mar. 31, 2010 General Motors Corporation [Member]	Jun. 30, 2011 General Motors Corporation [Member]	Dec. 31, 2010 General Motors Corporation [Member]
Financial services assets lease receivables	$ 3,869	$ 3,869		$ 4,502
Investments in financial leases, allowance for losses	202	202		202	202	266
Write-off against allowance for losses on investments in finance leases											64
Gross investment in finance leases	4,071	4,071		4,704								101	101
Leveraged lease charge	$ 627	$ 627	$ 95				$ 315	$ 315	$ 312	$ 312
Reduction in cumulative lease earnings excluding penalties and interest	50.00%
Permanent charge for interest on tax underpayments	50.00%