CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
ASSETS:
Securities held-to-maturity, fair value		$ 4,986	$ 5,058
STOCKHOLDERS’ EQUITY:
Preferred stock, par value (in dollars per share)		$ 25.00	$ 25.00
Preferred stock, authorized (in shares)		100,000,000	100,000,000
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common stock, authorized (in shares)		1,000,000,000	1,000,000,000
Common stock, issued (in shares)		565,684,331	564,630,542
Common stock, outstanding (in shares)		505,880,851	511,954,871
Treasury stock (in shares)		59,803,480	52,675,671
Series A Preferred Stock
STOCKHOLDERS’ EQUITY:
Preferred stock, par value (in dollars per share)		$ 25.00	$ 25.00
Preferred stock, liquidation preference (in dollars per share)		$ 1,000	$ 1,000
Preferred stock, authorized (in shares)		250,000	250,000
Preferred stock, issued (in shares)		250,000	250,000
Available-for-sale Securities
ASSETS:
Securities, pledged as collateral	[1]	$ 100	$ 256

[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.