Stock-Based Compensation Expense Recognized in Noninterest Expense (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restricted Stock Unit Expense		$ 30	$ 21	$ 84	$ 82
Performance Stock Units Expense	[1]	3	10	28	36
Share-based Payment Arrangement, Noncash Expense		33	31	112	118
Share-based Payment Arrangement, Expense, Tax Benefit	[2]	$ 8	$ 8	$ 27	$ 28

[1] Phantom stock units are settled in cash. During the three and nine months ended September 30, 2019, the Company paid less than $1 million and $44 million, respectively, related to these share-based liabilities. During the three and nine months ended September 30, 2018, the Company paid $1 million and $76 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.