Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Measurements [Abstract]

Financial Assets Liabilities Summary

	As of December
$ in millions		2012		2011
Total level 1 financial assets		$ 190,737		$ 136,780
Total level 2 financial assets		502,293		587,416
Total level 3 financial assets		47,095		47,937
Cash collateral and counterparty netting  1		(101,612	)	(120,821	)
Total financial assets at fair value		$ 638,513		$ 651,312
Total assets		$ 938,555		$ 923,225
Total level 3 financial assets as a percentage of Total assets		5.0	%	5.2	%
Total level 3 financial assets as a percentage of Total financial assets at fair value		7.4	%	7.4	%
Total level 1 financial liabilities		$   65,994		$   75,557
Total level 2 financial liabilities		318,764		319,160
Total level 3 financial liabilities		25,679		25,498
Cash collateral and counterparty netting  1		(32,760	)	(31,546	)
Total financial liabilities at fair value		$ 377,677		$ 388,669
Total level 3 financial liabilities as a percentage of Total financial liabilities at fair value		6.8	%	6.6	%

1. Represents the impact on derivatives of cash collateral netting, and counterparty netting across levels of the fair value hierarchy. Netting among positions classified in the same level is included in that level.