Derivative Financial Instruments Netting of Financial Instruments - Derivatives (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 6,125		$ 8,656
Derivative Asset, Fair Value, Amount Offset Against Collateral	4,741		6,573
Derivative Assets	1,384	[1]	2,083	[1]
Collateral Held by The Company Against Derivative Asset Positions	51		94
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	1,333		1,989
Derivative Liability, Fair Value, Gross Liability	5,673		7,514
Derivative Liability, Fair Value, Amount Offset Against Collateral	5,148		7,102
Derivative Liabilities	525	[2]	412	[2]
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	13		37
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	512		375
Derivatives Subject to Master Netting Arrangement or Similar Arrangement [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	5,285		8,041
Derivative Asset, Fair Value, Amount Offset Against Collateral	4,239		6,273
Derivative Assets	1,046		1,768
Collateral Held by The Company Against Derivative Asset Positions	51		94
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	995		1,674
Derivative Liability, Fair Value, Gross Liability	4,982		7,051
Derivative Liability, Fair Value, Amount Offset Against Collateral	4,646		6,802
Derivative Liabilities	336		249
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	13		37
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	323		212
Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member] [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	12		132
Derivative Asset, Fair Value, Amount Offset Against Collateral	0		0
Derivative Assets	12		132
Collateral Held by The Company Against Derivative Asset Positions	0		0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	12		132
Derivative Liability, Fair Value, Gross Liability	189		163
Derivative Liability, Fair Value, Amount Offset Against Collateral	0		0
Derivative Liabilities	189		163
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	189		163
Exchange Traded [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	828		483
Derivative Asset, Fair Value, Amount Offset Against Collateral	502		300
Derivative Assets	326		183
Collateral Held by The Company Against Derivative Asset Positions	0		0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	326		183
Derivative Liability, Fair Value, Gross Liability	502		300
Derivative Liability, Fair Value, Amount Offset Against Collateral	502		300
Derivative Liabilities	0		0
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ 0		$ 0

[1] 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. At December 31, 2012, $2.1 billion, net of $730 million offsetting cash collateral, is recognized in trading assets and derivatives within the Company's Consolidated Balance Sheets.

[2] 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. At December 31, 2012, $412 million, net of $1.3 billion offsetting cash collateral, is recognized in trading liabilities and derivatives within the Company's Consolidated Balance Sheets.