Derivative Financial Instruments Netting of Financial Instruments - Derivatives (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 5,577		$ 6,125
Derivative Asset, Fair Value, Amount Offset Against Collateral	4,244		4,741
Derivative Assets	1,333	[1]	1,384	[1]
Collateral Held by The Company Against Derivative Asset Positions	53		51
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	1,280		1,333
Derivative Liability, Fair Value, Gross Liability	5,225		5,673
Derivative Liability, Fair Value, Amount Offset Against Collateral	4,861		5,148
Derivative Liabilities	364	[2]	525	[2]
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	20		13
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	344		512
Derivatives Subject to Master Netting Arrangement or Similar Arrangement [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	4,804		5,285
Derivative Asset, Fair Value, Amount Offset Against Collateral	3,773		4,239
Derivative Assets	1,031		1,046
Collateral Held by The Company Against Derivative Asset Positions	53		51
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	978		995
Derivative Liability, Fair Value, Gross Liability	4,572		4,982
Derivative Liability, Fair Value, Amount Offset Against Collateral	4,390		4,646
Derivative Liabilities	182		336
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	20		13
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	162		323
Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member] [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	29		12
Derivative Asset, Fair Value, Amount Offset Against Collateral	0		0
Derivative Assets	29		12
Collateral Held by The Company Against Derivative Asset Positions	0		0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	29		12
Derivative Liability, Fair Value, Gross Liability	182		189
Derivative Liability, Fair Value, Amount Offset Against Collateral	0		0
Derivative Liabilities	182		189
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	182		189
Exchange Traded [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	744		828
Derivative Asset, Fair Value, Amount Offset Against Collateral	471		502
Derivative Assets	273		326
Collateral Held by The Company Against Derivative Asset Positions	0		0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	273		326
Derivative Liability, Fair Value, Gross Liability	471		502
Derivative Liability, Fair Value, Amount Offset Against Collateral	471		502
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 June 30, 2014, $1.3 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 June 30, 2014, $364 million, net of $972 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.