Consolidated Statement of Condition (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Current Assets:
Investment securities held to maturity, fair value	$ 17,536	$ 17,842
Loans and leases, allowance for losses	48	38
Premises and equipment, accumulated depreciation	$ 4,768	$ 4,599
Stockholders' Equity:
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares issued (in shares)	503,879,642	503,880,120
Preferred stock, shares authorized (in shares)	3,500,000	3,500,000
Treasury stock, shares (in shares)	100,086,970	88,684,969
Series C Preferred Stock
Stockholders' Equity:
Preferred stock, shares issued (in shares)	5,000	5,000
Preferred stock, shares outstanding (in shares)	5,000	5,000
Series D Preferred Stock
Stockholders' Equity:
Preferred stock, shares issued (in shares)	7,500	7,500
Preferred stock, shares outstanding (in shares)	7,500	7,500
Series E Preferred Stock
Stockholders' Equity:
Preferred stock, shares issued (in shares)	7,500	7,500
Preferred stock, shares outstanding (in shares)	7,500	7,500
Series F Preferred Stock
Stockholders' Equity:
Preferred stock, shares issued (in shares)	7,500	0
Preferred stock, shares outstanding (in shares)	7,500	0