Netting Arrangements Netting Arrangements Table (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
Assets
Derivative assets, gross amount	$ 9,229,000,000		$ 8,756,000,000
Derivative assets, gross amount offset	(8,422,000,000)	[1]	(8,422,000,000)	[1]
Derivative assets, net amount presented in the condensed consolidated balance sheets	807,000,000	[2]	334,000,000	[2]
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	(91,000,000)	[3]	(83,000,000)	[3]
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	(46,000,000)	[4]	(20,000,000)	[4]
Derivative assets, net amount	670,000,000		231,000,000
Securities purchased under agreements to resell or similar arrangements, gross amount	22,150,000,000	[5]	50,565,000,000	[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	22,150,000,000	[5]	50,565,000,000	[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	(22,150,000,000)	[4],[5]	(50,565,000,000)	[4],[5]
Securities purchased under agreements to resell or similar arrangements, net amount	0	[5]	0	[5]
Total assets, gross amount	31,379,000,000		59,321,000,000
Total assets, gross amount offset	(8,422,000,000)	[1]	(8,422,000,000)	[1]
Total assets, net amount presented in the condensed consolidated balance sheets	22,957,000,000		50,899,000,000
Total assets, under the master netting arrangements, not offset in the condensed consolidated balance sheets, financial instruments	(91,000,000)	[3]	(83,000,000)	[3]
Total assets, under master netting arrangements, not offset in the condensed consolidated balance sheets, collateral	(22,196,000,000)	[4]	(50,585,000,000)	[4]
Total assets, net amount	670,000,000		231,000,000
Derivative assets not subject to an enforceable master netting arrangement or similar agreement	29,000,000		1,739,000,000
Liabilities:
Derivative liabilities, gross amount	(10,250,000,000)
Derivative liabilities, gross amount offset	10,042,000,000	[1]
Derivative liabilities, net amount presented in the condensed consolidated balance sheets	(208,000,000)	[2]
Derivative liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	91,000,000	[3]
Derivative liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	0	[4]
Derivative liabilities, net amount	(117,000,000)
Securities sold under agreements to repurchase or similar arrangements, gross amount	(25,000,000)
Securities sold under agreements to repurchase or similar arrangements, gross amount offset	0	[1]
Securities sold under agreements to repurchase, or similar arrangements, net amount presented in the balance sheet	(25,000,000)
Securities sold under agreements to repurchase, under master netting arrangement, amounts not offset in balance sheet, financial instruments	0	[3]
Securities sold under agreements to repurchase or similar arrangements, under master netting arrangements, amounts not offset in balance sheet, collateral	25,000,000	[4]
Securities sold under agreements to repurchase, subject to master netting arrangements, net amount	0
Total liabilities, gross amount	(10,275,000,000)		(9,717,000,000)
Total liabilities, gross amount offset	10,042,000,000	[1]	9,370,000,000	[1]
Total liabilities, net amount presented in the condensed consolidated balance sheets	(233,000,000)		(347,000,000)	[2]
Total liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	91,000,000	[3]	83,000,000	[3]
Total liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	25,000,000	[4]	0	[4]
Total liabilities, net amount	(117,000,000)		(264,000,000)
Derivative liabilities not subject to an enforceable master netting arrangements or similar agreement	1,000,000		1,100,000,000
Risk Management Derivatives [Member]
Assets
Derivative assets, gross amount offset	(8,422,000,000)	[6]	(8,422,000,000)	[6]
Liabilities:
Derivative liabilities, gross amount offset	10,042,000,000	[6]	9,370,000,000	[6]
Mortgage related commitment derivatives [Member]
Assets
Derivative assets, gross amount	105,000,000		265,000,000
Derivative assets, gross amount offset	0	[1]	0	[1]
Derivative assets, net amount presented in the condensed consolidated balance sheets	105,000,000		265,000,000
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	(91,000,000)	[3]	(83,000,000)	[3]
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	0	[4]	0	[4]
Derivative assets, net amount	14,000,000		182,000,000
Liabilities:
Derivative liabilities, gross amount	(118,000,000)		(214,000,000)
Derivative liabilities, gross amount offset	0	[1]	0	[1]
Derivative liabilities, net amount presented in the condensed consolidated balance sheets	(118,000,000)		(214,000,000)
Derivative liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	91,000,000	[3]	83,000,000	[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	(27,000,000)		(131,000,000)
OTC Risk Management Derivatives [Member] | Risk Management Derivatives [Member]
Assets
Derivative assets, gross amount	7,781,000,000		8,491,000,000
Derivative assets, gross amount offset	(7,678,000,000)	[1]	(8,422,000,000)	[1]
Derivative assets, net amount presented in the condensed consolidated balance sheets	103,000,000		69,000,000
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	(46,000,000)	[4]	(20,000,000)	[4]
Derivative assets, net amount	57,000,000		49,000,000
Liabilities:
Derivative liabilities, gross amount	(9,143,000,000)		(9,503,000,000)
Derivative liabilities, gross amount offset	9,053,000,000	[1]	9,370,000,000	[1]
Derivative liabilities, net amount presented in the condensed consolidated balance sheets	(90,000,000)		(133,000,000)
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	(90,000,000)		(133,000,000)
OTC-Cleared Risk Management Derivatives [Member] | Risk Management Derivatives [Member]
Assets
Derivative assets, gross amount	1,343,000,000	[7]
Derivative assets, gross amount offset	(744,000,000)	[1],[7]
Derivative assets, net amount presented in the condensed consolidated balance sheets	599,000,000	[7]
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	0	[3],[7]
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	0	[4],[7]
Derivative assets, net amount	599,000,000	[7]
Liabilities:
Derivative liabilities, gross amount	(989,000,000)	[7]
Derivative liabilities, gross amount offset	989,000,000	[1],[7]
Derivative liabilities, net amount presented in the condensed consolidated balance sheets	0	[7]
Derivative liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	0	[3],[7]
Derivative liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	0	[4],[7]
Derivative liabilities, net amount	0	[7]
Cash and cash equivalents [Member]
Assets
Securities purchased under agreements to resell or similar arrangements	$ 9,400,000,000		$ 11,600,000,000

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

[2] Excludes derivative assets of $29 million and $1.7 billion and derivative liabilities of $1 million and $1.1 billion recognized in our condensed consolidated balance sheets as of March 31, 2014 and December 31, 2013, respectively, that are not subject to enforceable master netting arrangements.

[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 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 $9.4 billion and $11.6 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 March 31, 2014 and December 31, 2013, respectively.

[6] The netting adjustment for our risk management derivatives transactions represents the effect of the legal right to offset under legally enforceable master netting arrangements to settle with the same counterparty on a net basis, including cash collateral posted and received. Cash collateral posted was $2.8 billion and $2.0 billion as of March 31, 2014 and December 31, 2013, respectively. Cash collateral received was $1.2 billion and $1.0 billion as of March 31, 2014 and December 31, 2013, respectively.

[7] As of March 31, 2014, we net OTC-cleared derivative assets and derivative liabilities where we have enforceable master netting arrangements.