Description Of Business, Basis Of Presentation, And Changes In Significant Accounting Policies ResCap Bankruptcy Information (Details) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Impairment of Investment in ResCap		$ 442,000,000
Additional Accrual Based on FHFA and FDIC Settlement, Gross	170,000,000
Additional Accrual Based on FHFA and FDIC Settlement, Net of Tax	107,000,000
Accrual Based on FHFA and FDIC Settlement	520,000,000
ResCap settlement accrual	1,950,000,000	750,000,000
ResCap settlement accrual for insurance proceeds	150,000,000	0
Finance Receivable Due from ResCap	1,100,000,000
Escrow Payment to Suspend Foreclosure Review	$ 230,000,000