Income Taxes (Schedule of temporary tax differences that gave rise to significant portions of net deferred tax assets and liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets
ALLL	$ 655	$ 771
Postretirement plans	180	432
Net unrealized loss on AFS securities	172
Equity-based compensation	152	144
Reserves and expense accruals	181	150
Net unrealized loss on cash flow hedges	0	105
Other	189	213
Total deferred tax assets	1,529	1,815
Deferred tax liabilities
Prepaid pension plan expense	431	373
MSRs	380	201
Lease financing	315	270
Loan fees & expenses	263	244
Identifiable intangible assets	128	161
Depreciation	59	57
Derivatives & hedging	45	163
Net unrealized gain on AFS securities	0	201
Other	61	70
Total deferred tax liabilities	1,682	1,740
Net deferred tax asset (liability)	$ (153)	$ 75