Consolidated Statement of Condition (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Investment securities held-to-maturity, fair value	$ 40,483	$ 40,255
Loans and leases, allowance for losses	54	54
Premises and equipment, accumulated depreciation	$ 4,005	$ 3,881
Stockholders' Equity:
Preferred stock, no par value (in USD per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	3,500,000	3,500,000
Common stock, par value (in USD per share)	$ 1.00	$ 1.00
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	503,879,642	503,879,642
Treasury stock, shares	138,472,445	136,229,784
Series C Preferred Stock
Stockholders' Equity:
Preferred stock, shares issued	5,000	5,000
Preferred stock, shares outstanding	5,000	5,000
Series D Preferred Stock
Stockholders' Equity:
Preferred stock, shares issued	7,500	7,500
Preferred stock, shares outstanding	7,500	7,500
Series E Preferred Stock
Stockholders' Equity:
Preferred stock, shares issued	7,500	7,500
Preferred stock, shares outstanding	7,500	7,500
Series F Preferred Stock
Stockholders' Equity:
Preferred stock, shares issued	7,500	7,500
Preferred stock, shares outstanding	7,500	7,500
Series G Preferred Stock
Stockholders' Equity:
Preferred stock, shares issued	5,000	5,000
Preferred stock, shares outstanding	5,000	5,000