Consolidated Statement Of Condition (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Investment securities held to maturity, Fair Value	8,622	9,362
Loans and leases, allowance for losses	22	22
Premises and equipment, accumulated depreciation	3,955	3,673
Preferred stock, no par value	0	0
Preferred stock, shares authorized	3,500,000	3,500,000
Common stock, par	1	1
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	503,917,643	503,965,849
Treasury stock, shares	35,090,753	16,541,985
Series C Preferred Stock [Member]
Preferred stock, shares issued	5,000	5,000
Preferred stock, shares outstanding	5,000	5,000
Series A Preferred Stock [Member]
Preferred stock, shares issued	5,001	5,001
Preferred stock, shares outstanding	5,001	5,001