Commitments and Guarantees (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Total Indemnification and Repurchase Liability
Loss Contingencies [Line Items]
Reserves, Ending balance	$ 125
Residential Mortgage [Member] | Total Indemnification and Repurchase Liability
Loss Contingencies [Line Items]
Reserves, Ending balance	$ 97
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Standby letters of credit - Terms outstanding - Minimum	1 year
Standby letters of credit - Terms outstanding - Maximum	8 years
Standby letters of credit - Assets securing certain specifically identified standby letters of credit	$ 1,000
Standby letters of credit and participations in standby letters of credit - Liability carrying amount	187
Guarantee Of Indebtedness Of Others [Member] | Commercial Mortgage [Member]
Loss Contingencies [Line Items]
Commercial mortgage recourse obligations - Unpaid principal balance of loans sold	12,900	$ 12,300
Maximum Exposure	3,900	3,700
Reserves, Ending balance	35
Guarantee Of Indebtedness Of Others [Member] | Residential Mortgage [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Loss contingency, range of possible loss not accrued	81
Resale Agreements [Member]
Loss Contingencies [Line Items]
Fair value adjustment on resale agreements	$ 7	$ 7