Summary of Significant Accounting Policies, Nature of Operations and Other Developments Summary of Significant Accounting Policies, Nature of Operations and Other Developments(Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Depreciation, amortization and accretion, net	$ 299	$ 224
Payments for Origination and Purchases of Loans Held-for-sale	(914)	(599)
Net proceeds from sale of loans originated for sale	910	573
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	779	989
Proceeds from sales of loans	860	84
Payments for (Proceeds from) Loans and Leases	(748)	(6,387)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(2,802)	(6,663)
Net cash provided by (used in) financing activities	646	3,990
Cash and Cash Equivalents, Period Increase (Decrease)	(1,377)	(1,684)
Transfer of Portfolio Loans and Leases to Held-for-sale	$ 867	96
Scenario, Previously Reported [Member]
Depreciation, amortization and accretion, net		237
Payments for Origination and Purchases of Loans Held-for-sale		(309)
Net proceeds from sale of loans originated for sale		327
Net Cash Provided by (Used in) Operating Activities, Continuing Operations		1,046
Proceeds from sales of loans		330
Payments for (Proceeds from) Loans and Leases		(6,690)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(6,720)
Net cash provided by (used in) financing activities		3,990
Cash and Cash Equivalents, Period Increase (Decrease)		(1,684)
Transfer of Portfolio Loans and Leases to Held-for-sale		386
Restatement Adjustment [Member]
Depreciation, amortization and accretion, net		(13)
Payments for Origination and Purchases of Loans Held-for-sale		(290)
Net proceeds from sale of loans originated for sale		246
Net Cash Provided by (Used in) Operating Activities, Continuing Operations		(57)
Proceeds from sales of loans		(246)
Payments for (Proceeds from) Loans and Leases		303
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		57
Net cash provided by (used in) financing activities		0
Cash and Cash Equivalents, Period Increase (Decrease)		0
Transfer of Portfolio Loans and Leases to Held-for-sale		$ (290)