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Mortgage pass through certificate backed by securitization trusts original amount.

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Fair value of credit risk derivative asset.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Commitments, Guarantees and Contingencies (Contingencies) (Details) - USD ($) $ in Millions	Mar. 25, 2017	Jul. 15, 2010	Mar. 31, 2017	Jan. 23, 2015	Sep. 23, 2014	Sep. 19, 2014	Apr. 28, 2014	Dec. 30, 2013	Jul. 08, 2013	May 03, 2013	Jan. 10, 2013	Sep. 28, 2012	Aug. 08, 2012	Aug. 07, 2012
China Development Industrial Bank v. Morgan Stanley & Co. Incorporated et al.
Contingencies
Damages sought		$ 228
Credit default swap asset		275
Estimate of possible loss			$ 240
Loss in period		$ 12
Morgan Stanley Mortgage Loan Trust 2006-4SL, et al. v. Morgan Stanley Mortgage Capital Inc.
Contingencies
Original principal balance of loans in trust														$ 303
Morgan Stanley Mortgage Loan Trust 2006-4SL, et al. v. Morgan Stanley Mortgage Capital Inc. \| Maximum
Contingencies
Estimate of possible loss			149
Morgan Stanley Mortgage Loan Trust 2006-14SL, et al. v. Morgan Stanley Mortgage Capital Holdings LLC, as successor in interest to Morgan Stanley Mortgage Capital Inc.
Contingencies
Original principal balance of loans in trust													$ 354
Morgan Stanley Mortgage Loan Trust 2006-14SL, et al. v. Morgan Stanley Mortgage Capital Holdings LLC, as successor in interest to Morgan Stanley Mortgage Capital Inc. \| Maximum
Contingencies
Estimate of possible loss			527
Morgan Stanley Mortgage Loan Trust 2006-13ARX v. Morgan Stanley Mortgage Capital Holdings LLC, as successor in interest to Morgan Stanley Mortgage Capital Inc.
Contingencies
Original principal balance of loans in trust												$ 609
Morgan Stanley Mortgage Loan Trust 2006-13ARX v. Morgan Stanley Mortgage Capital Holdings LLC, as successor in interest to Morgan Stanley Mortgage Capital Inc. \| Maximum
Contingencies
Estimate of possible loss			170
Morgan Stanley Mortgage Loan Trust 2006-10SL, et al. v. Morgan Stanley Mortgage Capital Holdings LLC, as successor in interest to Morgan Stanley Mortgage Capital Inc.
Contingencies
Original principal balance of loans in trust											$ 300
Morgan Stanley Mortgage Loan Trust 2006-10SL, et al. v. Morgan Stanley Mortgage Capital Holdings LLC, as successor in interest to Morgan Stanley Mortgage Capital Inc. \| Maximum
Contingencies
Estimate of possible loss			197
Morgan Stanley Mortgage Loan Trust 2007-4SL v Morgan Stanley Mortgage Capital Holdings LLC
Contingencies
Original principal balance of loans in trust													$ 305
Deutsche Zentral-Genossenschaftsbank AG et al. v. Morgan Stanley et al.
Contingencies
Mortgage pass through certificate backed by securitization trusts original amount										$ 644
Mortgage pass through certificate backed by securitization trusts unpaid amount	$ 242
Mortgage pass through certificate incurred losses	$ 86
US Bank National Association, solely in its capacity as Trustee of the Morgan Stanley Mortgage Loan Trust 2007-2AX (MSM 2007-2AX) v. Morgan Stanley Mortgage Capital Holdings LLC, as Successor-by-Merger to Morgan Stanley Mortgage Capital Inc. and GreenPoint Mortgage Funding, Inc.
Contingencies
Original principal balance of loans in trust									$ 650
US Bank National Association, solely in its capacity as Trustee of the Morgan Stanley Mortgage Loan Trust 2007-2AX (MSM 2007-2AX) v. Morgan Stanley Mortgage Capital Holdings LLC, as Successor-by-Merger to Morgan Stanley Mortgage Capital Inc. and GreenPoint Mortgage Funding, Inc. \| Maximum
Contingencies
Estimate of possible loss			240
Wilmington Trust Company v. Morgan Stanley Mortgage Capital Holdings LLC et al.
Contingencies
Original principal balance of loans in trust								$ 516
Wilmington Trust Company v. Morgan Stanley Mortgage Capital Holdings LLC et al. \| Maximum
Contingencies
Estimate of possible loss			152
Deutsche Bank National Trust Company v. Morgan Stanley Mortgage Capital Holdings LLC
Contingencies
Original principal balance of loans in trust							$ 735
Deutsche Bank National Trust Company v. Morgan Stanley Mortgage Capital Holdings LLC \| Maximum
Contingencies
Estimate of possible loss			292
Financial Guaranty Insurance Company v. Morgan Stanley ABS Capital I Inc. et al. (NIMS 2007-1)
Contingencies
Original principal balance of loans in trust						$ 475
Financial Guaranty Insurance Company v. Morgan Stanley ABS Capital I Inc. et al. (NIMS 2007-1) \| Maximum
Contingencies
Estimate of possible loss			126
Financial Guaranty Insurance Company v. Morgan Stanley ABS Capital I Inc. et al. (Trust 2007-NC4)
Contingencies
Original principal balance of loans in trust					$ 876
Financial Guaranty Insurance Company v. Morgan Stanley ABS Capital I Inc. et al. (Trust 2007-NC4) \| Maximum
Contingencies
Estimate of possible loss			277
Deutsche Bank National Trust Company solely in its capacity as Trustee of the Morgan Stanley ABS Capital I Inc. Trust 2007-NC4 v. Morgan Stanley Mortgage Capital Holdings LLC as Successor-by-Merger to Morgan Stanley Mortgage Capital Inc., and Morgan Stanley ABS Capital I Inc.
Contingencies
Original principal balance of loans in trust				$ 1,050
Deutsche Bank National Trust Company solely in its capacity as Trustee of the Morgan Stanley ABS Capital I Inc. Trust 2007-NC4 v. Morgan Stanley Mortgage Capital Holdings LLC as Successor-by-Merger to Morgan Stanley Mortgage Capital Inc., and Morgan Stanley ABS Capital I Inc. \| Maximum
Contingencies
Estimate of possible loss			$ 277