Basis of Presentation and Accounting Policies Basis of Presentation and Accounting Policies (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014 Restatement Adjustment [Member]	Sep. 30, 2013 Restatement Adjustment [Member]	Sep. 30, 2014 Restatement Adjustment [Member]	Sep. 30, 2013 Restatement Adjustment [Member]	Jan. 02, 2013 Restatement Adjustment [Member]	Sep. 30, 2014 Retained Earnings	Sep. 30, 2013 Retained Earnings	Dec. 31, 2013 Retained Earnings	Dec. 31, 2012 Retained Earnings	Jan. 02, 2013 Retained Earnings Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to accrued income and other assets	$ (3,880)		$ (3,880)		$ (3,888)						$ 3
Decrease to retained earnings	(7,433)	(6,966)	(7,433)	(6,966)	(7,150)	(6,939)						(6,631)	(6,236)	(6,318)	(5,928)	3
Increase to other noninterest income	34	43	103	128				14		41
Increase to provision for income taxes	73	68	207	195				14		41
Impact on net income	$ 154	$ 147	$ 444	$ 424			$ 0	$ 0	$ 0	$ 0		$ 444	$ 424
Impact on basic net income per common share	$ 0.85	$ 0.80	$ 2.44	$ 2.28			$ 0.00	$ 0.00	$ 0.00	$ 0.00
Impact on diluted net income per common share	$ 0.82	$ 0.78	$ 2.35	$ 2.23			$ 0.00	$ 0.00	$ 0.00	$ 0.00