Allowance For Credit Losses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011	Jun. 30, 2012		Jun. 30, 2011
Loans and Leases Receivable, Allowance [Abstract]
Balance at beginning of period	$ 603		$ 771	$ 743	[1]	$ 852
Provision for credit losses	89		95	89		93
Charge-offs	(91)		(133)	(253)		(225)
Recoveries	18		14	40		27
Balance at end of period	$ 619	[1]	$ 747	$ 619	[1]	$ 747

[1] The following table summarizes assets and liabilities related to variable interest entities ("VIEs") as of June 30, 2012 and December 31, 2011 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation.