Offsetting Arrangements Liabilities With Enforceable Netting Arrangements (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Offsetting [Abstract]
Derivative, Net Amount of Liabilities Presented in Statement of Condition	$ 5,996	[1]	$ 5,367	[1]
Derivative, Counterparty Netting	0		0
Derivative, Collateral Provided	(2)		0
Derivative, Net Amount	5,994	[2]	5,367	[2]
Repurchase Agreements and Securities Lending, Net Amount of Liabilities Presented in Statement of Condition	15,026	[3],[4]	12,992	[3]
Repurchase Agreements and Securities Lending, Counterparty Netting	(205)	[4]	(126)	[4]
Repurchase Agreements and Securities Lending, Collateral Provided	(14,036)	[4]	(12,067)	[4]
Repurchase Agreements and Securities Lending, Net Amount	785	[2],[4]	799	[2],[4]
Total, Net Amount of Liabilities Presented in Statement of Condition	21,022		18,359
Total, Counterparty Netting	(205)		(126)
Total, Collateral Provided	(14,038)		(12,067)
Total, Net Amount	$ 6,779	[2]	$ 6,166	[2]

[1] Amounts include all transactions regardless of whether or not they are subject to an enforceable netting arrangement.

[2] Includes amounts secured by collateral not determined to be subject to enforceable netting arrangements.

[3] Included in the $15,026 million as of June 30, 2013 was $9,154 million of repurchase agreements and $5,872 million of collateral related to securities lending. Included in the $12,992 million as of December 31, 2012 was $8,006 million of repurchase agreements and $4,986 million of collateral related to securities lending. Repurchase agreements and collateral related to securities lending were recorded in securities sold under repurchase agreements and accrued expenses and other liabilities, respectively, in our consolidated statement of condition. Refer to note 8 for additional information with respect to principal securities finance transactions.

[4] Amounts subject to netting arrangements which have been determined to be legally enforceable