Derivative Financial Instruments Netting of Financial Instruments - Derivatives (parenthetical) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Derivative [Line Items]
Derivative Assets	$ 1,181	[1]	$ 1,384	[1]
Derivative Asset, Fair Value of Collateral	(355)		(457)
Derivative Liabilities	369	[2]	525	[2]
Derivative Liability, Fair Value of Collateral	(843)		(864)
Trading Liabilities [Member]
Derivative [Line Items]
Derivative Liabilities	369		525
Derivative Liability, Fair Value of Collateral	(843)		(864)
Trading Account Assets [Member]
Derivative [Line Items]
Derivative Assets	1,200		1,400
Derivative Asset, Fair Value of Collateral	$ (355)		$ (457)

[1] At March 31, 2014, $1.2 billion, net of $355 million offsetting cash collateral, is recognized in trading assets and derivatives within the Company's Consolidated Balance Sheets. At December 31, 2013, $1.4 billion, net of $457 million offsetting cash collateral, is recognized in trading assets and derivatives within the Company's Consolidated Balance Sheets.

[2] At March 31, 2014, $369 million, net of $843 million offsetting cash collateral, is recognized in trading liabilities and derivatives within the Company's Consolidated Balance Sheets. At December 31, 2013, $525 million, net of $864 million offsetting cash collateral, is recognized in trading liabilities and derivatives within the Company's Consolidated Balance Sheets.