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Fair Value Measurements
3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Fair Value Measurements
Fair Value Measurements
Our financial instruments consist primarily of cash and cash equivalents, short-term and long-term restricted cash and cash equivalents, short-term investments, customer accounts receivable, margin deposits and guaranty funds, equity investments, short-term and long-term debt and certain other short-term assets and liabilities. The fair value of our financial instruments are measured based on a three-level hierarchy:
Level 1 inputs — quoted prices for identical assets or liabilities in active markets.
Level 2 inputs — observable inputs other than Level 1 inputs such as quoted prices for similar assets and liabilities in active markets or inputs other than quoted prices that are directly observable.
Level 3 inputs — unobservable inputs supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
We use Level 1 inputs to determine fair value. The Level 1 assets consist of U.S. Treasury and other foreign government securities, equity and other securities listed in active markets, and investments in publicly traded mutual funds held for the purpose of providing future payments of the supplemental executive retirement and the supplemental executive savings plans.
Financial assets and liabilities recorded in the accompanying consolidated balance sheets as of March 31, 2018 and December 31, 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. Financial instruments measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017 are as follows (in millions):
 
As of March 31, 2018
 
As of December 31, 2017
 
Level 1
 
Level 2 and 3
 
Total
 
Level 1
 
Level 2 and 3
 
Total
Assets at fair value:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other foreign government securities
$
885

 
$

 
$
885

 
$
734

 
$

 
$
734

Mutual Funds
15

 

 
15

 
16

 

 
16

Total assets at fair value
$
900

 
$

 
$
900

 
$
750

 
$

 
$
750


As of March 31, 2018, we held $885 million in U.S. Treasury and other foreign government securities which are considered cash equivalents. Of these securities, $629 million were recorded as short-term restricted cash and cash equivalents and $256 million were recorded as long-term restricted cash and cash equivalents in the accompanying consolidated balance sheet as of March 31, 2018. We account for the U.S. Treasury securities at fair value.
Mutual funds are equity and fixed income mutual funds held for the purpose of providing future payments for the supplemental executive savings plan and the supplemental executive retirement plan and are classified as equity investments.
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 March 31, 2018 or December 31, 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 March 31, 2018, none of our intangible assets were required to be recorded at fair value since no impairments were recorded. Our investments in equity securities without a readily determinable fair value, including our investments in Euroclear and Coinbase, are measured using the measurement alternative in accordance with ASU 2016-01 and are discussed in Notes 2 and 3.
As of March 31, 2018, the fair value of our $495 million 2027 Senior Notes was $480 million, the fair value of our $1.24 billion 2025 Senior Notes was $1.28 billion, the fair value of our $792 million 2023 Senior Notes was $823 million, the fair value of our $495 million 2022 Senior Notes was $483 million, the fair value of our $1.24 billion 2020 Senior Notes was $1.24 billion, and the fair value of our $600 million 2018 Senior Notes was $599 million. 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 March 31, 2018. Excluding our investments in equity securities 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.