Netting Arrangements Netting Arrangements Table (Details) (USD $)	Jun. 30, 2013		Dec. 31, 2012
ASSETS
Derivative assets, gross amount	$ 14,412,000,000		$ 16,009,000,000
Derivative assets, gross amount offset	(12,073,000,000)	[1]	(15,791,000,000)	[1]
Derivative assets, net amount presented in the condensed consolidated balance sheets	2,339,000,000	[2]	218,000,000	[2]
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	(665,000,000)	[3]	(92,000,000)	[3]
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	(31,000,000)	[4]	(50,000,000)	[4]
Derivative assets, net amount	1,643,000,000		76,000,000
Securities purchased under agreements to resell or similar arrangements, gross amount	48,800,000,000	[5]	45,750,000,000	[5]
Securities purchased under agreements to resell or similar arrangements, gross amount offset	0	[1],[5]	0	[1],[5]
Securities purchased under agreements to resell or similar arrangements, net amount presented in the condensed consolidated balance sheets	48,800,000,000	[5]	45,750,000,000	[5]
Securities purchased under agreements to resell, under master netting arrangement, amounts not offset in the condensed consolidated balance sheets, financial instruments	0	[3],[5]	0	[3],[5]
Securities purchased under agreements to resell or similar arrangements, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	(48,800,000,000)	[4],[5]	(45,750,000,000)	[4],[5]
Securities purchased under agreements to resell or similar arrangements, net amount	0	[5]	0	[5]
Total assets, gross amount	63,212,000,000		61,759,000,000
Total assets, gross amount offset	(12,073,000,000)	[1]	(15,791,000,000)	[1]
Total assets, net amount presented in the condensed consolidated balance sheets	51,139,000,000		45,968,000,000
Total assets, under the master netting arrangements, not offset in the condensed consolidated balance sheets, financial instruments	(665,000,000)	[3]	(92,000,000)	[3]
Total assets, under master netting arrangements, not offset in the condensed consolidated balance sheets, collateral	(48,831,000,000)	[4]	(45,800,000,000)	[4]
Total assets, net amount	1,643,000,000		76,000,000
Liabilities:
Total liabilities, gross amount	(17,620,000,000)		(22,501,000,000)
Total liabilities, gross amount offset	15,785,000,000	[1]	22,046,000,000	[1]
Total liabilities, net amount presented in the condensed consolidated balance sheets	(1,835,000,000)	[2]	(455,000,000)	[2]
Total liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	665,000,000	[3]	92,000,000	[3]
Total liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	0	[4]	0	[4]
Total liabilities, net amount	(1,170,000,000)		(363,000,000)
Derivative assets not subject to an enforceable master netting arrangement or similar agreement	1,100,000,000		217,000,000
Derivative liabilities not subject to an enforceable master netting arrangements or similar agreement	1,100,000,000		250,000,000
OTC risk management derivatives [Member]
ASSETS
Derivative assets, gross amount	12,222,000,000		15,853,000,000
Derivative assets, gross amount offset	(12,073,000,000)	[1],[6]	(15,791,000,000)	[1],[6]
Derivative assets, net amount presented in the condensed consolidated balance sheets	149,000,000		62,000,000
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	0	[3]	0	[3]
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	(31,000,000)	[4]	(48,000,000)	[4]
Derivative assets, net amount	118,000,000		14,000,000
Liabilities:
Derivative liabilities, gross amount	(15,949,000,000)		(22,204,000,000)
Derivative liabilities, gross amount offset	15,785,000,000	[1],[6]	22,046,000,000	[1],[6]
Derivative liabilities, net amount presented in the condensed consolidated balance sheets	(164,000,000)		(158,000,000)
Derivative liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	0	[3]	0	[3]
Derivative liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	0	[4]	0	[4]
Derivative liabilities, net amount	(164,000,000)		(158,000,000)
Mortgage related commitment derivatives [Member]
ASSETS
Derivative assets, gross amount	2,190,000,000		156,000,000
Derivative assets, gross amount offset	0	[1]	0	[1]
Derivative assets, net amount presented in the condensed consolidated balance sheets	2,190,000,000		156,000,000
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	(665,000,000)	[3]	(92,000,000)	[3]
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	0	[4]	(2,000,000)	[4]
Derivative assets, net amount	1,525,000,000		62,000,000
Liabilities:
Derivative liabilities, gross amount	(1,671,000,000)		(297,000,000)
Derivative liabilities, gross amount offset	0	[1]	0	[1]
Derivative liabilities, net amount presented in the condensed consolidated balance sheets	(1,671,000,000)		(297,000,000)
Derivative liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	665,000,000	[3]	92,000,000	[3]
Derivative liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	0	[4]	0	[4]
Derivative liabilities, net amount	(1,006,000,000)		(205,000,000)
Cash and cash equivalents [Member]
Liabilities:
Securities purchased under agreements to resell or similar arrangements	$ 11,000,000,000		$ 13,300,000,000

[1] Represents the effect of the right to offset under legally enforceable master netting agreements to settle with the same counterparty on a net basis, including cash collateral posted and received and accrued interest.

[2] Excludes derivative assets of $1.1 billion and $217 million and derivative liabilities of $1.1 billion and $250 million recognized in our condensed consolidated balance sheets as of June 30, 2013 and December 31, 2012, respectively, that are not subject to an enforceable master netting arrangement or similar agreement.

[3] Mortgage commitment derivative amounts reflect where we have recognized both an asset and a liability with the same counterparty under an enforceable master netting arrangement but we have not elected to offset the related amounts in our condensed consolidated balance sheets.

[4] Represents non-cash collateral posted or received that has neither been recognized nor offset in our condensed consolidated balance sheets. Does not include collateral held in excess of our exposure.

[5] Includes $11.0 billion and $13.3 billion of securities purchased under agreements to resell or similar arrangements classified as “cash and cash equivalents” in our condensed consolidated balance sheets as of June 30, 2013 and December 31, 2012, respectively.

[6] The netting adjustment represents the effect of the legal right to offset under legally enforceable master netting agreements to settle with the same counterparty on a net basis, including cash collateral posted and received. Cash collateral posted was $4.4 billion and $6.3 billion as of June 30, 2013 and December 31, 2012, respectively. Since the agreements related to clearing contracts through derivatives clearing organizations do not provide us with a legal right of offset, no netting adjustments have been made for those contracts. Cash collateral received was $672 million as of June 30, 2013. No cash collateral was received as of December 31, 2012.