Fair Value Measurements	12 Months Ended
Fair Value Measurements	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Financial assets and liabilities recorded or disclosed at fair value in the accompanying consolidated balance sheets as of December 31, 2018 and 2017 are classified in their entirety based on the lowest level of input that is significant to the asset or liability’s fair value measurement. Our mutual funds are equity and fixed income mutual funds held for the purpose of providing future payments for the supplemental executive savings plan and SERP and are classified as equity investments and measured at fair value using Level 1 inputs with adjustments recorded in net income (Note 16). MERS holds fixed income investments in order to satisfy the original terms of the governing documents of our June 2016 acquisition of a majority equity position in MERS (Note 4). These investments are measured at fair value using Level 2 inputs with adjustments recorded in net income. We did not use Level 3 inputs to determine the fair value of assets or liabilities measured at fair value on a recurring basis as of December 31, 2018 or 2017. We measure certain assets, such as intangible assets, at fair value on a non-recurring basis. These assets are recognized at fair value if they are deemed to be impaired. As of December 31, 2018 and 2017, except for the fair value adjustment related to our $4 million impairment of exchange registration intangible assets associated with the closure of ICE Futures Canada and ICE Clear Canada (Note 8), none of our intangible assets were required to be recorded at fair value since no other impairments were recorded. We measure certain equity investments at fair value on a non-recurring basis using our policy election under ASU No. 2016-01 (Note 2). During 2018, we evaluated transactions involving these investments and concluded that no fair value adjustments were required under this election. See Note 14 for the fair value considerations related to our margin deposits, guaranty funds and delivery contracts receivable. As of December 31, 2018, (i) the fair value of our $1.23 billion 2048 Senior Notes was $1.24 billion, (ii) the fair value of our $591 million 2028 Senior Notes was $599 million, (iii) the fair value of our $496 million 2027 Senior Notes was $477 million, (iv) the fair value of our $1.24 billion 2025 Senior Notes was $1.26 billion, (v) the fair value of our $793 million October 2023 Senior Notes was $821 million, (vi) the fair value of our $397 million September 2023 Senior Notes was $402 million, (vii) the fair value of our $496 million 2022 Senior Notes was $484 million, and (viii) the fair value of our $1.25 billion 2020 Senior Notes was $1.24 billion. The fair values of these fixed rate notes were estimated using quoted market prices for these instruments. The fair value of our commercial paper approximates the carrying value since the rates of interest on this short-term debt approximate market rates as of December 31, 2018. Excluding our equity investments without a readily determinable fair value, all other financial instruments are determined to approximate carrying value due to the short period of time to their maturities.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.