Commitments and Guarantees (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended												9 Months Ended							3 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 Direct and indirect investments [Member]	Sep. 30, 2014 Private equity investments [Member]	Sep. 30, 2014 Direct investments [Member]	Sep. 30, 2014 Total Indemnification and Repurchase Liability	Dec. 31, 2013 Total Indemnification and Repurchase Liability	Sep. 30, 2013 Total Indemnification and Repurchase Liability	Dec. 31, 2012 Total Indemnification and Repurchase Liability	Sep. 30, 2014 Residential Mortgage [Member] Maximum [Member]	Sep. 30, 2014 Residential Mortgage [Member] Total Indemnification and Repurchase Liability	Dec. 31, 2013 Residential Mortgage [Member] Total Indemnification and Repurchase Liability	Sep. 30, 2013 Residential Mortgage [Member] Total Indemnification and Repurchase Liability	Dec. 31, 2012 Residential Mortgage [Member] Total Indemnification and Repurchase Liability	Sep. 30, 2014 Financial Standby Letter of Credit [Member]	Sep. 30, 2014 Recourse Obligations [Member] Commercial Mortgage [Member]	Dec. 31, 2013 Recourse Obligations [Member] Commercial Mortgage [Member]	Sep. 30, 2013 Recourse Obligations [Member] Commercial Mortgage [Member]	Dec. 31, 2012 Recourse Obligations [Member] Commercial Mortgage [Member]	Sep. 30, 2014 Resale Agreements [Member]	Dec. 31, 2013 Resale Agreements [Member]	Dec. 31, 2013 Agency settlements [Member]
Loss Contingencies [Line Items]
Equity funding		$ 50,000,000	$ 20,000,000
Unfunded commitments			145,000,000	9,000,000
Standby letters of credit - Terms outstanding - Minimum														1 year
Standby letters of credit - Terms outstanding - Maximum														8 years
Maximum Exposure															3,600,000,000	3,600,000,000
Standby letters of credit - Assets securing certain specifically identified standby letters of credit														1,100,000,000
Standby letters of credit and participations in standby letters of credit - Liability carrying amount														191,000,000
Standby bond purchase agreements to support municipal bond obligations	1,100,000,000
Commercial mortgage recourse obligations - Unpaid principal balance of loans sold															11,800,000,000	11,700,000,000
Visa Escrow Account Funding	450,000,000
Reserves, Beginning balance					132,000,000	153,000,000	494,000,000	672,000,000		108,000,000	131,000,000	471,000,000	614,000,000		36,000,000	33,000,000	38,000,000	43,000,000
Reserves, Ending balance					132,000,000	153,000,000	494,000,000	672,000,000		108,000,000	131,000,000	471,000,000	614,000,000		36,000,000	33,000,000	38,000,000	43,000,000
Losses																					191,000,000
Loss contingency, range of possible loss not accrued									91,000,000
Fair value adjustment on resale agreements																			$ 8,000,000	$ 11,000,000