Netting Arrangements Netting Arrangements Table (Details) (USD $)	Mar. 31, 2013		Dec. 31, 2012
ASSETS
Derivative assets, gross amount	$ 14,596,000,000		$ 16,009,000,000
Derivative assets, gross amount offset	(14,334,000,000)	[1]	(15,791,000,000)	[1]
Derivative assets, net amount presented in the condensed consolidated balance sheets	262,000,000	[2]	218,000,000	[2]
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	(158,000,000)	[3]	(92,000,000)	[3]
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	(40,000,000)	[4]	(50,000,000)	[4]
Derivative assets, net amount	64,000,000		76,000,000
Securities purchased under agreements to resell or similar arrangements, gross amount	79,350,000,000		45,750,000,000	[5]
Securities purchased under agreements to resell or similar arrangements, gross amount offset	0	[1]	0	[1],[5]
Securities purchased under agreements to resell or similar arrangements, net amount presented in the condensed consolidated balance sheets	79,350,000,000		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]	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	(79,350,000,000)	[4]	(45,750,000,000)	[4],[5]
Securities purchased under agreements to resell or similar arrangements, under master netting arrangements, net amount	0		0	[5]
Total assets, gross amount	93,946,000,000		61,759,000,000
Total assets, gross amount offset	(14,334,000,000)	[1]	(15,791,000,000)	[1]
Total assets, net amount presented in the condensed consolidated balance sheets	79,612,000,000		45,968,000,000
Total assets, under the master netting arrangements, not offset in the condensed consolidated balance sheets, financial instruments	(158,000,000)	[3]	(92,000,000)	[3]
Total assets, under master netting arrangements, not offset in the condensed consolidated balance sheets, collateral	(79,390,000,000)	[4]	(45,800,000,000)	[4]
Total assets, net amount	64,000,000		76,000,000
Liabilities:
Derivative liabilities, gross amount	(20,393,000,000)
Derivative liabilities, gross amount offset	19,911,000,000	[1]
Derivative liabilities, net amount presented in the condensed consolidated balance sheets	(482,000,000)	[2]
Derivative liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	158,000,000	[3]
Derivative liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	0	[4]
Derivative liabilities, net amount	(324,000,000)
Securities sold under agreements to repurchase or similar arrangements, gross amount	(218,000,000)
Securities sold under agreements to repurchase or similar arrangements, gross amount offset	0	[1]
Securities sold under agreements to repurchase, net amount presented in the condensed consolidated balance sheets	(218,000,000)
Securities sold under agreements to repurchase, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	0	[3]
Securities sold under agreements to repurchase or similar arrangements, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	218,000,000	[4]	0
Securities sold under agreements to repurchase or similar arrangements, net amount	0
Total liabilities, gross amount	(20,611,000,000)		(22,501,000,000)
Derivative Liability, Securities Sold under Agreements to Resell, Securities Loaned, Asset	19,911,000,000	[1]	22,046,000,000	[1]
Total liabilities, net amount presented in the condensed consolidated balance sheets	700,000,000		455,000,000	[2]
Total liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	158,000,000	[3]	92,000,000	[3]
Total liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	218,000,000	[4]	0	[4]
Total liabilities, net amount	(324,000,000)		(363,000,000)
Derivative assets not subject to an enforceable master netting adjustment or similar arrangement	257,000,000		217,000,000
Derivative liabilities not subject to an enforceable master netting adjustment or similar arrangement	298,000,000		250,000,000
OTC risk management derivatives [Member]
ASSETS
Derivative assets, gross amount	14,374,000,000		15,853,000,000
Derivative assets, gross amount offset	(14,334,000,000)	[1],[6]	(15,791,000,000)	[1],[6]
Derivative assets, net amount presented in the condensed consolidated balance sheets	40,000,000		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	(39,000,000)	[4]	(48,000,000)	[4]
Derivative assets, net amount	1,000,000		14,000,000
Liabilities:
Derivative liabilities, gross amount	(20,057,000,000)		(22,204,000,000)
Derivative liabilities, gross amount offset	19,911,000,000	[1],[6]	22,046,000,000	[1],[6]
Derivative liabilities, net amount presented in the condensed consolidated balance sheets	(146,000,000)		(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	(146,000,000)		(158,000,000)
Mortgage related commitment derivatives [Member]
ASSETS
Derivative assets, gross amount	222,000,000		156,000,000
Derivative assets, gross amount offset	0	[1]	0	[1]
Derivative assets, net amount presented in the condensed consolidated balance sheets	222,000,000		156,000,000
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	(158,000,000)	[3]	(92,000,000)	[3]
Derivative assets, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, collateral	(1,000,000)	[4]	(2,000,000)	[4]
Derivative assets, net amount	63,000,000		62,000,000
Liabilities:
Derivative liabilities, gross amount	(336,000,000)		(297,000,000)
Derivative liabilities, gross amount offset	0	[1]	0	[1]
Derivative liabilities, net amount presented in the condensed consolidated balance sheets	(336,000,000)		(297,000,000)
Derivative liabilities, under master netting arrangements, amounts not offset in the condensed consolidated balance sheets, financial instruments	158,000,000	[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	(178,000,000)		(205,000,000)
Cash and cash equivalents [Member]
Liabilities:
Securities purchased under agreements to resell or similar arrangements	$ 0		$ 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 $257 million and $217 million and derivative liabilities of $298 million and $250 million recognized in our condensed consolidated balance sheets as of March 31, 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 $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 December 31, 2012.

[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 $5.6 billion and $6.3 billion as of March 31, 2013 and December 31, 2012, respectively. No cash collateral was received as of March 31, 2013 and December 31, 2012.