Commitments and Guarantees (Other Commitments) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Other Commitments [Line Items]
Commitments	$ 151,792	$ 154,937
Commitments to extend credit [Member]
Other Commitments [Line Items]
Commitments	138,242	138,592
Commitments to extend credit [Member] | Total commercial lending [Member]
Other Commitments [Line Items]
Commitments	97,334	98,742
Commitments to extend credit [Member] | Home Equity Lines of Credit [Member]
Other Commitments [Line Items]
Commitments	17,570	17,839
Commitments to extend credit [Member] | Credit Card [Member]
Other Commitments [Line Items]
Commitments	18,999	17,833
Commitments to extend credit [Member] | Other [Member]
Other Commitments [Line Items]
Commitments	4,339	4,178
Standby letters of credit [Member]
Other Commitments [Line Items]
Commitments	9,509	9,991
Standby letters of credit [Member] | Remarketing Programs [Member]
Other Commitments [Line Items]
Commitments	5,200	5,200
Reinsurance Agreements [Member]
Other Commitments [Line Items]
Commitments	2,118	4,297
Standby bond purchase agreements [Member]
Other Commitments [Line Items]
Commitments	959	1,095
Other commitments [Member]
Other Commitments [Line Items]
Commitments	964	962
Other commitments [Member] | Investments in qualified affordable housing projects [Member]
Other Commitments [Line Items]
Commitments	$ 579	$ 441