Consolidated Statement of Condition (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current Assets:
Investment securities held to maturity, fair value	$ 18,865	$ 17,560
Loans and leases, allowance for losses	34	28
Premises and equipment, accumulated depreciation	$ 4,538	$ 4,417
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)	503,880,120	503,882,841
Preferred stock, shares authorized (in shares)	3,500,000	3,500,000
Treasury stock, shares (in shares)	83,948,535	69,754,255
Series C Preferred Stock
Stockholders' Equity:
Preferred stock, shares issued, Series C (in shares)	5,000	5,000
Preferred stock, shares outstanding, Series C (in shares)	5,000	5,000
Series D Preferred Stock
Stockholders' Equity:
Preferred stock, shares issued, Series C (in shares)	7,500
Preferred stock, shares outstanding, Series C (in shares)	7,500