Reconciliation of Net Income to Net Income Available to Common Shareholders (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Net Income (Loss) Attributable to Parent		$ 643	$ 468	[1],[2]
Dividends, Preferred Stock, Cash	[3]	(31)	(17)
Net Income (Loss) Available to Common Stockholders, Basic		$ 612	$ 451
Average basic common shares		468,723	490,091
Weighted Average Number of Shares Outstanding, Diluted		473,620	496,002
Net income/(loss) per average common share - diluted		$ 1.29	$ 0.91
Earnings Per Share, Basic		$ 1.31	$ 0.92
Restricted Stock Units (RSUs) [Member]
Dilutive securities		2,800	3,200
Warrant [Member]
Dilutive securities		1,400	1,800
Employee Stock Option [Member]
Dilutive securities		700	900

[1] Beginning in the second quarter of 2017, the Company realigned its business segment structure from three segments to two segments. Specifically, the Company retained the previous composition of the Wholesale Banking segment and changed the basis of presentation of the Consumer Banking and Private Wealth Management segment and Mortgage Banking segment such that those segments were combined into a single Consumer segment. Accordingly, business segment information presented for the three months ended March 31, 2017 has been revised to conform to the new business segment structure and updated internal funds transfer pricing methodology for consistent presentation.

[2] During the fourth quarter of 2017, the Company sold PAC, the results of which were previously reported within the Wholesale business segment. For all periods prior to January 1, 2018, PAC's financial results, including the gain on sale, have been transferred to Corporate Other for enhanced comparability of the Wholesale business segment excluding PAC.

[3] For the three months ended March 31, 2018, dividends were $1,000 per share for both Series A and B Preferred Stock, $1,469 per share for Series E Preferred Stock, $1,406 per share for Series F Preferred Stock, $1,038 per share for Series G Preferred Stock, and $1,281 per share for Series H Preferred Stock.For the three months ended March 31, 2017, dividends were $1,000 per share for both Series A and B Preferred Stock, $1,469 per share for Series E Preferred Stock, and $1,406 per share for Series F Preferred Stock.