Income Taxes (Deferred Income Taxes Included in Other Assets in the Consolidated Balance Sheets) (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Deferred Income Tax Assets And Liabilities
Allowance for loan and lease losses	$ 439	$ 445
Deferred compensation	122	118
Reserves	57	61
Reserve for unfunded commitments	56	48
State net operating loss carryforwards	9	10
Other	223	194
Total deferred tax assets	906	876
Lease financing	940	935
Investments in joint ventures and partnership interests	219	248
MSRs and related economic hedges	202	245
State deferred taxes	64	79
Bank premises and equipment	61	53
Other comprehensive income	34	106
Other	173	218
Total deferred tax liabilities	1,693	1,884
Total net deferred tax liabilities	$ (787)	$ (1,008)