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Commitments, Guarantees and Contingencies (Narrative) (Details) (USD $)
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12 Months Ended | 0 Months Ended | 0 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2012
Abu Dhabi Commercial Bank, et al. v. Morgan Stanley & Co. Inc., et al.
plaintiff
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Aug. 25, 2008
Abu Dhabi Commercial Bank, et al. v. Morgan Stanley & Co. Inc., et al.
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Jul. 15, 2010
China Development Industrial Bank v. Morgan Stanley & Co. Incorporated et al.
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Dec. 31, 2012
China Development Industrial Bank v. Morgan Stanley & Co. Incorporated et al.
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Jan. 25, 2013
Federal Home Loan Bank of San Francisco v. Credit Suisse Securities (USA) LLC, et al. and Federal Home Loan Bank of San Francisco v. Deutsche Bank Securities Inc. et al.
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Mar. 15, 2010
Federal Home Loan Bank of San Francisco v. Credit Suisse Securities (USA) LLC, et al.
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Mar. 15, 2010
Federal Home Loan Bank of San Francisco v. Deutsche Bank Securities Inc. et al.
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Jan. 25, 2013
Federal Home Loan Bank of Chicago v. Bank of America Funding Corporation et al.
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Oct. 15, 2010
Federal Home Loan Bank of Chicago v. Bank of America Funding Corporation et al.
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Jul. 18, 2011
Western and Southern Life Insurance Company et al. v. Morgan Stanley Mortgage Capital Inc. et al.
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Dec. 31, 2012
Cambridge Place Investment Management Inc. v. Morgan Stanley & Co., Inc. et al.
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Jan. 25, 2013
Federal Housing Finance Agency, as Conservator v. Morgan Stanley et al.
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Sep. 02, 2011
Federal Housing Finance Agency, as Conservator v. Morgan Stanley et al.
claims
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Dec. 31, 2012
Sponsored Residential Mortgag-Backed Securities
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Dec. 31, 2012
Whole Loan Sale
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Dec. 31, 2012
Loans without Representations and Warranties
Sponsored Residential Mortgag-Backed Securities
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Dec. 31, 2012
Representations and Warranties
Sponsored Residential Mortgag-Backed Securities
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Dec. 31, 2012
Representations and Warranties
Whole Loan Sale
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Dec. 31, 2012
U.S. Commercial Mortgage Loans
Commercial Mortgage Loans
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Dec. 31, 2012
Non-U.S. Commercial Mortgage Loans
Current, When Known
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Dec. 31, 2012
Non-U.S. Commercial Mortgage Loans
Unpaid Principle Balance Not Known
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Dec. 31, 2012
Non-U.S. Commercial Mortgage Loans
Commercial Mortgage Loans
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| Total of minimum rentals to be received in the future under non-cancelable operating subleases | $ 114,000,000 | ||||||||||||||||||||||||
| Total rent expense, net of sublease rental income | 765,000,000 | 781,000,000 | 788,000,000 | ||||||||||||||||||||||
| Maximum Potential Payout/Notional | 148,000,000,000 | 25,000,000,000 | |||||||||||||||||||||||
| Carrying Amount (Asset)/Liability | 6,100,000,000 | ||||||||||||||||||||||||
| Guarantee obligation when current unpaid principal balance is unknown | 18,900,000,000 | ||||||||||||||||||||||||
| Guarantee obligation of all unpaid principal balance total | 44,900,000,000 | ||||||||||||||||||||||||
| Secured debt | 80,000,000,000 | 47,000,000,000 | |||||||||||||||||||||||
| Insolvent debtor loans | 21,000,000,000 | ||||||||||||||||||||||||
| Accrual for payments owed as a result of breach of representations and warranties | 35,000,000,000 | ||||||||||||||||||||||||
| Unpaid principle balance | 20,100,000,000 | 33,200,000,000 | 4,900,000,000 | 400,000,000 | |||||||||||||||||||||
| Cumulative losses on sponsored securities | 12,300,000,000 | ||||||||||||||||||||||||
| Loans originated | 47,000,000,000 | 21,000,000,000 | |||||||||||||||||||||||
| Contingencies | |||||||||||||||||||||||||
| Value of securities issued | 852,000,000 | ||||||||||||||||||||||||
| Number of plaintiffs | 14 | ||||||||||||||||||||||||
| Damages sought | 638,000,000 | 228,000,000 | |||||||||||||||||||||||
| Estimate of possible loss, maximum | 638,000,000 | 240,000,000 | |||||||||||||||||||||||
| Credit default swap asset | 275,000,000 | ||||||||||||||||||||||||
| Loss in period | 12,000,000 | ||||||||||||||||||||||||
| Mortgage pass through certificate backed by securitization trusts original amount | 704,000,000 | 276,000,000 | 203,000,000 | 153,000,000 | 344,000,000 | 11,000,000,000 | |||||||||||||||||||
| Mortgage pass through certificate backed by securitization trusts unpaid amount | 365,000,000 | 105,000,000 | 2,900,000,000 | ||||||||||||||||||||||
| Mortgage pass through certificate incurred losses | $ 40,000,000 | ||||||||||||||||||||||||
| Number of complaints | 17 | ||||||||||||||||||||||||