Organization	9 Months Ended
Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	1. Organization: Morgan Stanley Smith Barney Charter WNT L.P. (the “Partnership”) is a Delaware limited partnership organized in 1998 to engage primarily in the speculative trading of futures contracts, options on futures and forward contracts, and forward contracts on physical commodities and other commodity interests, including, but not limited to, foreign currencies, financial instruments, metals, energy and agricultural products (collectively, “Futures Interests”) (refer to Note 4, “Financial Instruments”). The General Partner (defined below) may also determine to invest up to all of the Partnership’s assets in United States (“U.S.”) Treasury bills and/or money market mutual funds, including money market mutual funds managed by Morgan Stanley or its affiliates. The Partnership is one of the Morgan Stanley Charter series of funds, comprised of the Partnership, Morgan Stanley Smith Barney Charter Aspect L.P. and Morgan Stanley Smith Barney Charter Campbell L.P. Ceres Managed Futures LLC, a Delaware limited liability company, acts as the general partner (“Ceres” or the “General Partner”) and commodity pool operator for the Partnership. Ceres is a wholly-owned subsidiary of Morgan Stanley Smith Barney Holdings LLC (“MSSBH”). MSSBH is wholly-owned indirectly by Morgan Stanley. Morgan Stanley Smith Barney LLC is doing business as Morgan Stanley Wealth Management (“Morgan Stanley Wealth Management”). Morgan Stanley Wealth Management is a principal subsidiary of MSSBH. During the reporting periods ended September 30, 2016 and 2015, the Partnership’s commodity broker was Morgan Stanley & Co. LLC (“MS&Co.”), a registered futures commission merchant. The Partnership also deposits a portion of its cash in a non-trading account at JPMorgan Chase Bank, N.A. MS&Co. also acts as the counterparty on all trading of foreign currency forward contracts. MS&Co. is a wholly-owned subsidiary of Morgan Stanley. Winton Capital Management Limited (the “Trading Advisor”) is the trading advisor to the Partnership. In July 2015, the General Partner delegated certain administrative functions to SS&C Technologies, Inc., a Delaware corporation, currently doing business as SS&C GlobeOp (the “Administrator”). Pursuant to a master services agreement, the Administrator furnishes certain administrative, accounting, regulatory reporting, tax and other services as agreed from time to time. In addition, the Administrator maintains certain books and records of the Partnership. The General Partner pays or reimburses the Partnership, from the General Partner fee (formerly, the administrative fee) it receives, the ordinary administrative expenses of the Partnership. This includes the expenses related to the engagement of the Administrator. Therefore, the engagement of the Administrator did not impact the Partnership’s break-even point.

1. Organization:

Morgan Stanley Smith Barney Charter WNT L.P. (the “Partnership”) is a Delaware limited partnership organized in 1998 to engage primarily in the speculative trading of futures contracts, options on futures and forward contracts, and forward contracts on physical commodities and other commodity interests, including, but not limited to, foreign currencies, financial instruments, metals, energy and agricultural products (collectively, “Futures Interests”) (refer to Note 4, “Financial Instruments”). The General Partner (defined below) may also determine to invest up to all of the Partnership’s assets in United States (“U.S.”) Treasury bills and/or money market mutual funds, including money market mutual funds managed by Morgan Stanley or its affiliates. The Partnership is one of the Morgan Stanley Charter series of funds, comprised of the Partnership, Morgan Stanley Smith Barney Charter Aspect L.P. and Morgan Stanley Smith Barney Charter Campbell L.P.

Ceres Managed Futures LLC, a Delaware limited liability company, acts as the general partner (“Ceres” or the “General Partner”) and commodity pool operator for the Partnership. Ceres is a wholly-owned subsidiary of Morgan Stanley Smith Barney Holdings LLC (“MSSBH”). MSSBH is wholly-owned indirectly by Morgan Stanley. Morgan Stanley Smith Barney LLC is doing business as Morgan Stanley Wealth Management (“Morgan Stanley Wealth Management”). Morgan Stanley Wealth Management is a principal subsidiary of MSSBH.

During the reporting periods ended September 30, 2016 and 2015, the Partnership’s commodity broker was Morgan Stanley & Co. LLC (“MS&Co.”), a registered futures commission merchant. The Partnership also deposits a portion of its cash in a non-trading account at JPMorgan Chase Bank, N.A. MS&Co. also acts as the counterparty on all trading of foreign currency forward contracts. MS&Co. is a wholly-owned subsidiary of Morgan Stanley. Winton Capital Management Limited (the “Trading Advisor”) is the trading advisor to the Partnership.

In July 2015, the General Partner delegated certain administrative functions to SS&C Technologies, Inc., a Delaware corporation, currently doing business as SS&C GlobeOp (the “Administrator”). Pursuant to a master services agreement, the Administrator furnishes certain administrative, accounting, regulatory reporting, tax and other services as agreed from time to time. In addition, the Administrator maintains certain books and records of the Partnership. The General Partner pays or reimburses the Partnership, from the General Partner fee (formerly, the administrative fee) it receives, the ordinary administrative expenses of the Partnership. This includes the expenses related to the engagement of the Administrator. Therefore, the engagement of the Administrator did not impact the Partnership’s break-even point.