Allowance for Credit Losses (Commercial Credit Exposure Credit Risk Profile by Internal Loan Risk Rating) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Held for sale	$ 1,965		$ 3,697
Commercial and Industrial [Member]
Corporate credit exposure, amount	34,166	[1]	34,050	[1]
Commercial and Industrial [Member] | Investment Grade [Member]
Corporate credit exposure, amount	8,212		8,358
Commercial and Industrial [Member] | Near Investment Grade [Member]
Corporate credit exposure, amount	17,095		16,637
Commercial and Industrial [Member] | Noninvestment Grade-Performing [Member]
Corporate credit exposure, amount	8,248		8,547
Commercial and Industrial [Member] | Noninvestment Grade-NonPerforming [Member]
Corporate credit exposure, amount	611	[1]	508	[1]
Commercial Real Estate - Other [Member]
Corporate credit exposure, amount	11,134	[1]	11,439	[1]
Commercial Real Estate - Other [Member] | Investment Grade [Member]
Corporate credit exposure, amount	783		687
Commercial Real Estate - Other [Member] | Near Investment Grade [Member]
Corporate credit exposure, amount	4,493		4,618
Commercial Real Estate - Other [Member] | Noninvestment Grade-Performing [Member]
Corporate credit exposure, amount	5,391		5,729
Commercial Real Estate - Other [Member] | Noninvestment Grade-NonPerforming [Member]
Corporate credit exposure, amount	467	[1]	405	[1]
Commercial Real Estate - Residential ADC [Member]
Corporate credit exposure, amount	2,689	[1]	3,397	[1]
Commercial Real Estate - Residential ADC [Member] | Investment Grade [Member]
Corporate credit exposure, amount	45		35
Commercial Real Estate - Residential ADC [Member] | Near Investment Grade [Member]
Corporate credit exposure, amount	385		512
Commercial Real Estate - Residential ADC [Member] | Noninvestment Grade-Performing [Member]
Corporate credit exposure, amount	1,799		2,337
Commercial Real Estate - Residential ADC [Member] | Noninvestment Grade-NonPerforming [Member]
Corporate credit exposure, amount	460	[1]	513	[1]
Commercial Specialized Lending [Member]
Corporate credit exposure, amount	3,622	[1]	3,403	[1]
Commercial Specialized Lending [Member] | Investment Grade [Member]
Corporate credit exposure, amount	2,100		2,070
Commercial Specialized Lending [Member] | Near Investment Grade [Member]
Corporate credit exposure, amount	868		756
Commercial Specialized Lending [Member] | Noninvestment Grade-Performing [Member]
Corporate credit exposure, amount	643		566
Commercial Specialized Lending [Member] | Noninvestment Grade-NonPerforming [Member]
Corporate credit exposure, amount	11	[1]	11	[1]
Nonaccrual Loans and Leases [Member]
Held for sale	$ 116		$ 521

[1] Excludes nonperforming commercial loans held for sale of $116 million and $521 million as of June 30, 2011 and December 31, 2010, respectively.