Commitments and Guarantees (Narrative) (Details) - Standby letters of credit [Member] $ in Billions	3 Months Ended
	Mar. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Standby letters of credit - Terms outstanding - Minimum	1 year
Standby letters of credit - Terms outstanding - Maximum	9 years
Standby letters of credit - Assets securing certain specifically identified standby letters of credit	$ 1.1
Standby letters of credit and participations in standby letters of credit - Liability carrying amount	$ 0.2