Investments	6 Months Ended
Investments	Jun. 30, 2021
Equity Method Investments and Joint Ventures [Abstract]
Investments	Investments Our equity investments, including our investment in Euroclear plc, or Euroclear, among others, are subject to valuation under ASU 2016-01, Financial Instruments- Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, or ASU 2016-01. See Note 15 for a discussion of our determination of fair value of our financial instruments. Investment in Coinbase On December 1, 2014, we acquired preferred stock of Coinbase Global, Inc., or Coinbase, which operates a cryptocurrency exchange platform, for $10 million, representing a 1.4% ownership share on a fully-diluted, as-converted basis. On April 14, 2021, Coinbase completed an initial public offering, or IPO. On April 15, 2021, we completed the sale of our investment in Coinbase for $1.24 billion and recorded a gain of $1.23 billion, or $898 million net of tax, as other income in our consolidated statement of income. Investment in OCC We own a 40% interest in the Options Clearing Corporation, or OCC, through a direct investment by the NYSE and which is regulated by the SEC and the Commodity Futures Trading Commission, or CFTC, that we treat as an equity method investment. OCC is included in other non-current assets in the accompanying consolidated balance sheet. We recognized $34 million and $35 million during the six months ended June 30, 2021 and 2020, respectively, and $9 million and $18 million during the three months ended June 30, 2021 and 2020, respectively, of equity earnings as our share of OCC's estimated profits, which is included in other income. Included within the amount recognized during the six months ended June 30, 2021 is a $16 million earnings adjustment to reflect higher than reported 2020 net income than originally estimated by OCC. Similarly, included within the amount recognized during the six months ended June 30, 2020 is a $7 million earnings adjustment to reflect higher than reported 2019 net income than originally estimated. Investment in BondLink, Inc. On May 12, 2021, we made a 35.0% strategic investment in BondLink, Inc., or BondLink, a financial technology company that provides cloud-based debt management software solutions to governments financing infrastructure in the municipal bond market. The Series B investment is designed to accelerate BondLink’s growth and product development, including by providing a variety of our market-leading data sets to municipalities as they prepare to issue bonds. We treat BondLink as an equity method investment which is included in other non-current assets in the accompanying consolidated balance sheet, and we record equity earnings of our share of BondLink's estimated profits, which we include in other income. Investment in Euroclear We own a 9.8% stake in Euroclear as of June 30, 2021, and we participate on the Euroclear Board of Directors. Euroclear is a provider of post-trade services, including settlement, central securities depositories and related services for cross-border transactions across asset classes. We recognized dividend income of $30 million during the six months ended June 30, 2021, which is included in other income. As a result of a 2020 European regulation limiting dividend payments, we did not receive a Euroclear dividend in 2020. We are currently exploring a sale of our equity investment in Euroclear, and as a result, have reclassified the $666 million carrying value of our investment from other non-current assets to other current assets within our accompanying consolidated balance sheet as of June 30, 2021.