Description Of Business, Basis Of Presentation, And Changes In Significant Accounting Policies ResCap Bankruptcy Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Impairment of Investment in ResCap	$ 442
ResCap settlement accrual	750	1,950
ResCap settlement accrual for insurance proceeds		150
Finance Receivable Due from ResCap		1,127
Escrow Payment to Suspend Foreclosure Review		$ 230