Deferred Income Taxes Included in Other Assets in the Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Deferred Income Tax Assets And Liabilities [Abstract]
Allowance for loan & lease losses	$ 445	$ 463
Deferred compensation	118	113
Reserves	61	96
Reserve for unfunded commitments	48	47
State net operating losses	10	18
Other	194	189
Total deferred tax assets	876	926
Lease financing	935	896
Investments in joint ventures and partnership interests	248	329
MSRs and related economic hedges	245	237
Other comprehensive income	106	231
Qualifying Hedges And Free Standing Derivatives	58	105
Bank premises and equipment	53	103
State deferred taxes	79	81
Other	160	148
Total deferred tax liabilities	1,884	2,130
Total net deferred tax liabilities	$ (1,008)	$ (1,204)