Derivative Financial Instruments (Schedule Of The Fair Values Of Derivative Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	$ 6,110	[1]	$ 5,478	[1]
Fair value of derivative liabilities	4,778	[2]	4,399	[2]
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	6,024		5,255
Fair value of derivative liabilities	4,465		4,054
Interest-rate contracts
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	86		223
Fair value of derivative liabilities	313		345
Derivatives not designated as hedging instruments | Other assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	10,019		9,304
Derivatives not designated as hedging instruments | Other liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	9,698		9,137
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	9,969		9,243
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	9,639		9,067
Derivatives not designated as hedging instruments | Interest-rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	50		61
Derivatives not designated as hedging instruments | Interest-rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	50		61
Derivatives not designated as hedging instruments | Other derivative contracts | Other assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	0		0
Derivatives not designated as hedging instruments | Other derivative contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	9		9
Derivatives designated as hedging instruments | Other assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	280		297
Derivatives designated as hedging instruments | Other liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	267		301
Derivatives designated as hedging instruments | Foreign exchange contracts | Other assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	244		135
Derivatives designated as hedging instruments | Foreign exchange contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	4		17
Derivatives designated as hedging instruments | Interest-rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	36		162
Derivatives designated as hedging instruments | Interest-rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	$ 263		$ 284

[1] In addition to the $322 million and $433 million as of March 31, 2013 and December 31, 2012, respectively. we have $4,189 million and $4,123 million, respectively, of derivative assets not determined to be subject to enforceable netting arrangements. Refer to notes 2 and 10 for additional information with respect to derivative financial instrument balances recorded in our consolidated statement of condition.

[2] In addition to the $183 million and $328 million as of March 31, 2013 and December 31, 2012, respectively, we have $5,187 million and $5,039 million, respectively, of derivative liabilities not determined to be subject to enforceable netting arrangements. Refer to notes 2 and 10 for additional information with respect to derivative financial instrument balances recorded in our consolidated statement of condition.