Securities (Gains and Losses Recognized in Income from Available-for-Sale and Trading Securities) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Securities
Available-for-sale debt and other securities, realized gains		$ 13	$ 35
Available-for-sale debt and other securities, realized losses		(14)	(43)
OTTI		0	0
Net realized gains (losses) on available-for-sale debt and other securities		(1)	(8)
Total trading debt securities gains (losses)		3	(13)
Total equity securities gains (losses)	[1]	17	(3)
Total available for sale debt and other, trading debt and equity securities gains (losses) recognized in income	[2]	$ 19	$ (24)

[1] Includes a net unrealized gain of $ 19 and a net unrealized loss of $ 2 for the three months ended March 31, 2019 and 2018 , respectively.

[2] Excludes an insignificant amount of securities gains (losses) included in corporate banking revenue and wealth and asset management revenue in the Condensed Consolidated Statements of Income related to securities held by FTS to facilitate the timely execution of customer transactions.