Income Taxes (Deferred Income Taxes Included in Other Assets in the Consolidated Balance Sheets) (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Deferred Income Tax Assets And Liabilities
Allowance for loan and lease losses	$ 251	$ 439
Deferred compensation	77	122
Reserves	34	56
Reserve for unfunded commitments	29	57
State net operating loss carryforwards	9	9
Other	102	223
Total deferred tax assets	502	906
Lease financing	616	940
Investments in joint ventures and partnership interests	34	219
MSRs and related economic hedges	111	202
State deferred taxes	64	64
Bank premises and equipment	42	61
Other comprehensive income	21	34
Other	137	173
Total deferred tax liabilities	1,025	1,693
Total net deferred tax liabilities	$ (523)	$ (787)