Income Taxes (Deferred Income Taxes Included in Other Assets in the Consolidated Balance Sheets) (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Deferred Income Tax Assets And Liabilities
Allowance for loan and lease losses	$ 232	$ 251
Deferred compensation	79	77
Other comprehensive income	42	0
Reserve for unfunded commitments	28	29
Reserves	28	34
State net operating loss carryforwards	7	9
Other	112	103
Total deferred tax assets	528	503
Lease financing	599	616
Investments in joint ventures and partnership interests	131	85
MSRs and related economic hedges	107	111
State deferred taxes	73	68
Bank premises and equipment	60	42
Other comprehensive income	0	21
Other	102	137
Total deferred tax liabilities	1,072	1,080
Total net deferred tax liabilities	$ (544)	$ (577)