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		6 Months Ended				3 Months Ended		6 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014 Restatement Adjustment [Member]	Jun. 30, 2013 Restatement Adjustment [Member]	Jun. 30, 2014 Restatement Adjustment [Member]	Jun. 30, 2013 Restatement Adjustment [Member]	Jan. 02, 2013 Restatement Adjustment [Member]	Jun. 30, 2014 Retained Earnings	Jun. 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	$ (3,935)		$ (3,935)		$ (3,888)						$ 3
Decrease to retained earnings	(7,369)	(6,908)	(7,369)	(6,908)	(7,150)	(6,939)						(6,520)	(6,124)	(6,318)	(5,928)	3
Increase to other noninterest income	37	48	70	86				14		27
Increase to provision for income taxes	70	64	134	127				14		27
Impact on net income	$ 151	$ 143	$ 290	$ 277			$ 0	$ 0	$ 0	$ 0		$ 290	$ 277
Impact on basic net income per common share	$ 0.83	$ 0.77	$ 1.59	$ 1.48			$ 0.00	$ 0.00	$ 0.00	$ 0.00
Impact on diluted net income per common share	$ 0.80	$ 0.76	$ 1.54	$ 1.46			$ 0.00	$ 0.00	$ 0.00	$ 0.00