Consolidated Statement Of Condition (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets:
Investment securities held to maturity, fair value	$ 13,869	$ 11,661
Loans and leases, allowance for losses	22	22
Premises and equipment, accumulated depreciation	$ 4,109	$ 4,037
Stockholders' Equity:
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	503,896,123	503,900,268
Preferred stock, shares authorized	3,500,000	3,500,000
Treasury stock, shares	48,303,938	45,238,208
Series C Preferred Stock
Stockholders' Equity:
Preferred stock, shares issued, Series C	5,000	5,000
Preferred stock, shares outstanding, Series C	5,000	5,000