Derivative Instruments- Offsetting (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Derivative Asset [Abstract]
Asset derivatives fair value	$ 23,127	[1]	$ 20,288	[1]
Derivative assets subject to netting arrangements, gross amounts offset in the balance sheet	17,141	[2],[3]	15,806	[2],[3]
Derivative assets after impact of netting arrangements, net assets recognized on the balance sheet	5,986		4,482
Derivative assets subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	551		620
Derivative assets subject to collateral agreements, gross amounts not offset in the balance sheet cash collateral received	0		0
Derivative assets after impact of netting arrangements and collateral agreements, net amount	5,435		3,862
Total derivatives not subject to netting arrangements	3,303		2,105
Securities Purchased under Agreements to Resell, Gross	9,973		5,511
Reverse repurchase agreements subject to netting arrangements, gross amounts offset in the balance sheet	1,168	[2],[4]	1,096	[2],[4]
Reverse repurchase agreements after impact of netting arrangements, net assets recognized on the balance sheet	8,805		4,415
Reverse repurchase agreements subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	8,802		4,413
Reverse repurchase agreements subject to collateral agreements, gross amounts not offset in the balance sheet, cash collateral received	0		0
Securities Purchased under Agreements to Resell	3		2
Securities borrowing, gross assets recognized	8,553		4,669
Securities borrowing after impact of netting arrangements, net assets recognized on the balance sheet	8,553		4,669
Securities borrowing subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	8,239		4,555
Securities borrowing after impact of netting arrangements and collateral agreements, net amount	314		114
Fair value of financial and derivative assets, gross assets recognized	41,653		30,468
Fair value of financial and derivative assets subject to netting arrangements, gross amounts offset in the balance sheet	18,309	[2]	16,902	[2]
Fair value of financial and derivative assets after impact of netting arrangements, net assets recognized on the balance sheet	23,344		13,566
Fair value of financial and derivative assets subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	17,592		9,588
Fair value of financial and derivative assets subject to collateral agreements, gross amounts not offset in the balance sheet, cash collateral received	0		0
Fair value of financial and derivative assets after impact of netting arrangements and collateral agreements, net amount	5,752		3,978
Derivative Liability [Abstract]
Liability derivatives fair value	23,126	[1]	20,254	[1]
Derivative liabilities subject to netting arrangements, gross amounts offset in the balance sheet	16,635	[3],[5]	14,421	[3],[5]
Derivative liability after impact of netting arrangements, net liabilities recognized on the balance sheet	6,491		5,833
Derivative liabilities subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	2,464		2,337
Derivative liabilities subject to collateral agreements, gross amounts not offset in the balance sheet, cash collateral pledged	0		0
Derivative liabilities after impact of netting arrangements and collateral agreements, net amount	4,027		3,496
Total derivatives not subject to netting arrangements	2,762		2,248
Securities Sold under Agreements to Repurchase, Gross	8,024		8,581
Repurchase agreements subject to netting arrangements, gross amounts offset in the balance sheet	1,168	[5],[6]	1,096	[5],[6]
Repurchase agreements after impact of netting arrangements, net liabilities recognized on the balance sheet	6,856		7,485
Repurchase agreements subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	6,849		7,482
Repurchase agreements subject to collateral agreements, gross amounts not offset in the balance sheet, cash collateral pledged	0		0
Securities Sold under Agreements to Repurchase	7		3
Securities lending, gross liabilities recognized	2,658		1,947
Securities lending after impact of netting arrangements, net liabilities recognized on the balance sheet	2,658		1,947
Securities lending subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	2,547		1,884
Securities lending after impact of netting arrangements and collateral agreements, net amount	111		63
Fair value of financial and derivative liabilities, gross liabilities recognized	33,808		30,782
Fair value of financial and derivative liabilities subject to netting arrangements, gross amounts offset in the balance sheet	17,803	[5]	15,517	[5]
Fair value of financial and derivative liabilities after impact netting arrangements, net liabilities recognized on the balance sheet	16,005		15,265
Fair value of financial and derivative liabilities subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	11,860		11,703
Fair value of financial and derivative liabilities subject to collateral agreements, gross amounts not offset in the balance sheet, cash collateral pledged	0		0
Fair value of financial and derivative liabilities after impact of netting arrangements and collateral agreements, net amount	4,145		3,562
Derivatives subject to netting arrangements:
Derivative Asset [Abstract]
Asset derivatives fair value	19,824		18,183
Derivative assets subject to netting arrangements, gross amounts offset in the balance sheet	17,141	[2]	15,806	[2]
Derivative assets after impact of netting arrangements, net assets recognized on the balance sheet	2,683		2,377
Derivative assets subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	551		620
Derivative assets subject to collateral agreements, gross amounts not offset in the balance sheet cash collateral received	0		0
Derivative assets after impact of netting arrangements and collateral agreements, net amount	2,132		1,757
Derivative Liability [Abstract]
Liability derivatives fair value	20,364		18,006
Derivative liabilities subject to netting arrangements, gross amounts offset in the balance sheet	16,635	[5]	14,421	[5]
Derivative liability after impact of netting arrangements, net liabilities recognized on the balance sheet	3,729		3,585
Derivative liabilities subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	2,464		2,337
Derivative liabilities subject to collateral agreements, gross amounts not offset in the balance sheet, cash collateral pledged	0		0
Derivative liabilities after impact of netting arrangements and collateral agreements, net amount	1,265		1,248
Interest rate contracts | Derivatives subject to netting arrangements:
Derivative Asset [Abstract]
Asset derivatives fair value	14,761		14,798
Derivative assets subject to netting arrangements, gross amounts offset in the balance sheet	13,269	[2]	13,231	[2]
Derivative assets after impact of netting arrangements, net assets recognized on the balance sheet	1,492		1,567
Derivative assets subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	395		599
Derivative assets subject to collateral agreements, gross amounts not offset in the balance sheet cash collateral received	0		0
Derivative assets after impact of netting arrangements and collateral agreements, net amount	1,097		968
Derivative Liability [Abstract]
Liability derivatives fair value	15,688		14,914
Derivative liabilities subject to netting arrangements, gross amounts offset in the balance sheet	13,450	[5]	12,429	[5]
Derivative liability after impact of netting arrangements, net liabilities recognized on the balance sheet	2,238		2,485
Derivative liabilities subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	1,842		1,686
Derivative liabilities subject to collateral agreements, gross amounts not offset in the balance sheet, cash collateral pledged	0		0
Derivative liabilities after impact of netting arrangements and collateral agreements, net amount	396		799
Foreign exchange contracts | Derivatives subject to netting arrangements:
Derivative Asset [Abstract]
Asset derivatives fair value	4,732		2,778
Derivative assets subject to netting arrangements, gross amounts offset in the balance sheet	3,708	[2]	2,294	[2]
Derivative assets after impact of netting arrangements, net assets recognized on the balance sheet	1,024		484
Derivative assets subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	151		18
Derivative assets subject to collateral agreements, gross amounts not offset in the balance sheet cash collateral received	0		0
Derivative assets after impact of netting arrangements and collateral agreements, net amount	873		466
Derivative Liability [Abstract]
Liability derivatives fair value	4,174		2,292
Derivative liabilities subject to netting arrangements, gross amounts offset in the balance sheet	3,003	[5]	1,711	[5]
Derivative liability after impact of netting arrangements, net liabilities recognized on the balance sheet	1,171		581
Derivative liabilities subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	372		382
Derivative liabilities subject to collateral agreements, gross amounts not offset in the balance sheet, cash collateral pledged	0		0
Derivative liabilities after impact of netting arrangements and collateral agreements, net amount	799		199
Equity contracts | Derivatives subject to netting arrangements:
Derivative Asset [Abstract]
Asset derivatives fair value	331		607
Derivative assets subject to netting arrangements, gross amounts offset in the balance sheet	164	[2]	281	[2]
Derivative assets after impact of netting arrangements, net assets recognized on the balance sheet	167		326
Derivative assets subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	5		3
Derivative assets subject to collateral agreements, gross amounts not offset in the balance sheet cash collateral received	0		0
Derivative assets after impact of netting arrangements and collateral agreements, net amount	162		323
Derivative Liability [Abstract]
Liability derivatives fair value	502		800
Derivative liabilities subject to netting arrangements, gross amounts offset in the balance sheet	182	[5]	281	[5]
Derivative liability after impact of netting arrangements, net liabilities recognized on the balance sheet	320		519
Derivative liabilities subject to collateral agreements, gross amounts not offset in the balance sheet, financial instruments	250		269
Derivative liabilities subject to collateral agreements, gross amounts not offset in the balance sheet, cash collateral pledged	0		0
Derivative liabilities after impact of netting arrangements and collateral agreements, net amount	$ 70		$ 250

[1] Fair values are on a gross basis, before consideration of master netting agreements, as required by ASC 815.

[2] Includes the effect of netting agreements and net cash collateral paid. The offset related to the over-the-counter derivatives was allocated to the various types of derivatives based on the net positions.

[3] aster netting agreements includes cash collateral received and paid of $1,122 million and $616 million, respectively, at Sept. 30, 2014, and $1,841 million and $456 million, respectively, at Dec. 31, 2013.

[4] Offsetting of reverse repurchase agreements relates to our involvement in the Fixed Income Clearing Corporation, where we settle government securities transactions on a net basis for payment and delivery through the Fedwire system.

[5] Includes the effect of netting agreements and net cash collateral received. The offset related to the over-the-counter derivatives was allocated to the various types of derivatives based on the net positions.

[6] Offsetting of repurchase agreements relates to our involvement in the Fixed Income Clearing Corporation, where we settle government securities transactions on a net basis for payment and delivery through the Fedwire system.