Commitments, Guarantees and Contingencies (Commitments) (Details) $ in Millions	Sep. 30, 2015 USD ($)
Commitment, Fiscal Year Maturity
Less than 1	$ 97,409
1-3 years	28,957
3-5 years	49,388
Over 5 years	12,563
Total	188,317
Letters of Credit and Other Financial Guarantees Obtained to Satisfy Collateral Requirements
Commitment, Fiscal Year Maturity
Less than 1	315
1-3 years	8
3-5 years	0
Over 5 years	1
Total	324
Investment Activities
Commitment, Fiscal Year Maturity
Less than 1	484
1-3 years	61
3-5 years	20
Over 5 years	533
Total	1,098
Primary Lending Commitments - Investment Grade
Commitment, Fiscal Year Maturity
Less than 1	13,636
1-3 years	20,928
3-5 years	34,007
Over 5 years	3,453
Total	72,024
Unfunded commitments accounted for as held for investment	1,800
Primary Lending Commitments - Non-investment Grade
Commitment, Fiscal Year Maturity
Less than 1	2,278
1-3 years	6,246
3-5 years	14,131
Over 5 years	5,947
Total	28,602
Unfunded commitments accounted for as held for investment	3,000
Secondary Lending Commitments
Commitment, Fiscal Year Maturity
Less than 1	45
1-3 years	81
3-5 years	48
Over 5 years	40
Total	214
Commitments for Secured Lending Transactions
Commitment, Fiscal Year Maturity
Less than 1	1,895
1-3 years	294
3-5 years	511
Over 5 years	1,188
Total	3,888
Forward Starting Reverse Repurchase Agreements and Securities Borrowing Agreements
Commitment, Fiscal Year Maturity
Less than 1	73,680
1-3 years	0
3-5 years	0
Over 5 years	0
Total	73,680
Maximum commitment under reverse repurchase facility	1,300
Commitments due in the next three business days	60,300
Commercial and Residential Mortgage-related Commitments
Commitment, Fiscal Year Maturity
Less than 1	18
1-3 years	359
3-5 years	70
Over 5 years	1,262
Total	1,709
Other Lending Commitments
Commitment, Fiscal Year Maturity
Less than 1	5,058
1-3 years	980
3-5 years	601
Over 5 years	139
Total	$ 6,778