Stock-Based Compensation Expense Recognized in Noninterest Expense (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted Stock Unit Expense		$ 83	$ 56	$ 46
Performance Stock Units Expense	[1]	77	67	32
Restricted Stock or Unit Expense		0	2	16
Stock or Unit Option Plan Expense		0	0	1
Share-based Compensation		160	125	95
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	[2]	$ 61	$ 48	$ 36

[1] Phantom stock units are settled in cash. The Company paid $80 million, $28 million, and $16 million during the years ended December 31, 2017, 2016, and 2015, 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.