Derivative Financial Instruments Netting of Financial Instruments - Derivatives (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 5,340		$ 6,125
Derivative Asset, Fair Value, Amount Offset Against Collateral	4,103		4,741
Derivative Assets	1,237	[1]	1,384	[1]
Collateral Held by The Company Against Derivative Asset Positions	58		51
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	1,179		1,333
Derivative Liability, Fair Value, Gross Liability	5,027		5,673
Derivative Liability, Fair Value, Amount Offset Against Collateral	4,667		5,148
Derivative Liabilities	360	[2]	525	[2]
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	19		13
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	341		512
Derivatives Subject to Master Netting Arrangement or Similar Arrangement [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	4,526		5,285
Derivative Asset, Fair Value, Amount Offset Against Collateral	3,613		4,239
Derivative Assets	913		1,046
Collateral Held by The Company Against Derivative Asset Positions	58		51
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	855		995
Derivative Liability, Fair Value, Gross Liability	4,385		4,982
Derivative Liability, Fair Value, Amount Offset Against Collateral	4,177		4,646
Derivative Liabilities	208		336
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	19		13
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	189		323
Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member] [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	17		12
Derivative Asset, Fair Value, Amount Offset Against Collateral	0		0
Derivative Assets	17		12
Collateral Held by The Company Against Derivative Asset Positions	0		0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	17		12
Derivative Liability, Fair Value, Gross Liability	151		189
Derivative Liability, Fair Value, Amount Offset Against Collateral	0		0
Derivative Liabilities	151		189
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	151		189
Exchange Traded [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	797		828
Derivative Asset, Fair Value, Amount Offset Against Collateral	490		502
Derivative Assets	307		326
Collateral Held by The Company Against Derivative Asset Positions	0		0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	307		326
Derivative Liability, Fair Value, Gross Liability	491		502
Derivative Liability, Fair Value, Amount Offset Against Collateral	490		502
Derivative Liabilities	1		0
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ 1		$ 0

[1] At September 30, 2014, $1.2 billion, net of $312 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 September 30, 2014, $360 million, net of $876 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.