Stock-Based Compensation Expense Recognized in Noninterest Expense (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restricted Stock or Unit Expense		$ 22	$ 16	$ 60	$ 50
Performance Stock Units Expense	[1]	9	16	27	40
Share-based Compensation		31	32	87	90
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	[2]	$ 7	$ 12	$ 21	$ 34

[1] Phantom stock units are settled in cash. During the three and six months ended June 30, 2018, the Company paid $1 million and $75 million, respectively, related to these share-based liabilities. During the three and six months ended June 30, 2017, the Company paid $1 million and $77 million, 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.