Stock-Based Compensation Expense Recognized in Noninterest Expense (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restricted Stock Unit Expense		$ 29	$ 22	$ 54	$ 60
Performance Stock Units Expense	[1]	13	9	25	27
Share-based Compensation		42	31	79	87
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	[2]	$ 10	$ 7	$ 19	$ 21

[1] Phantom stock units are settled in cash. During the three and six months ended June 30, 2019, the Company paid less than $1 million and $44 million, respectively, related to these share-based liabilities. 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.

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