Commitments, Contingencies and Guarantees (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)
Commitments to extend credit
Commitment, Contingencies and Guarantees disclosures
Commitments	$ 32,598
Issued standby and commercial letters of credit
Commitment, Contingencies and Guarantees disclosures
Commitments	$ 5,784
Maximum term	1 year
Carrying value	$ 4
Other commitments
Commitment, Contingencies and Guarantees disclosures
Commitments	$ 162