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DERIVATIVE INSTRUMENTS - Effect of Interest Rate Swaps on Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Net Interest Component of Interest Rate Swaps | $ 134,035 | $ (48,160)
Realized Gains (Losses) on Termination of Interest Rate Swaps | (588,256) | 834
Unrealized Gains (Losses) on Interest Rate Swaps | $ (390,556) | $ 977,285

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- Definition Realized gain (loss) included in earnings for net interest payments from interest rate swaps. + References No definition available. + Details
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- Definition Gain or loss on the termination of interest rate swap agreements recognized during the period. + References No definition available. + Details
Name: | nly_GainLossOnTerminationOfInterestRateSwaps
Namespace Prefix: | nly_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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