Stock-Based Compensation Expense Recognized in Noninterest Expense (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted Stock Unit Expense		$ 104	$ 83	$ 56
Performance Stock Units Expense	[1]	35	77	67
Restricted Stock or Unit Expense		1	0	2
Share-based Compensation		140	160	125
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	[2]	$ 34	$ 61	$ 48

[1] Phantom stock units are settled in cash. The Company paid $76 million, $80 million, and $28 million during the years ended December 31, 2018, 2017, and 2016, respectively, related to these share-based liabilities.

[2] Does not include excess tax benefits or deficiencies recognized in the Provision for income taxes in the Consolidated Statements of Income.