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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Fair Value Measurements | FAIR VALUE MEASUREMENTS Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. We are required to classify these financial assets and liabilities into two groups: recurring—measured on a periodic basis and non-recurring—measured on an as-needed basis. There are three levels of inputs that may be used to measure fair value: Level 1 Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 2 Quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in inactive markets; or valuations based on models where the significant inputs are observable or can be corroborated by observable market data. Level 3 Valuations based on models where significant inputs are not observable. Unobservable inputs are used when little or no market data is available and reflect the Company’s own assumptions about the assumptions market participants would use. Assets and liabilities measured at fair value on a recurring basis as of December 31, 2020, and 2019, are summarized in the following tables.
| December 31, 2020 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Available-for-sale securities | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Trading securities | 5 |  |  | 5 |  |  | — |  |  | — |
| December 31, 2019 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Available-for-sale securities | $ | 5 |  |  | $ | — |  |  | $ | — |  |  | $ | 5 |
Trading securities | 4 |  |  | 4 |  |  | — |  |  | — |
Trading securities consist of rabbi trust financial assets, which are recorded in other assets in our Consolidated Balance Sheets. The rabbi trust holds assets attributable to the elections of certain management employees to defer the receipt of a portion of their compensation. The assets of the rabbi trust are invested in mutual funds and are reported at fair value based on active market quotations, which represent Level 1 inputs. The valuation of our ARS investment portfolio was subject to uncertainties that are difficult to predict. Factors that may have impacted our valuation included changes to credit ratings of the securities as well as to the underlying assets supporting those securities, rates of default of the underlying assets, underlying collateral value, discount rates, counterparty risk, and ongoing strength and quality of market credit and liquidity. During 2020, we sold our ARS and recognized a $3 million gain on available-for-sale securities, which is included in investment income in the Consolidated Statements of Income. As of December 31, 2020, we had no available-for-sale securities, and at December 31, 2019, we had $5 million ($19 million, par value) invested in ARS. The following table summarizes changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the twelve months ended December 31, 2020, and 2019.
| Available-for- sale securities |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2018 | $ | 6 |  |  |  |  |  |  |  |  |  |  |  |  |
Return of principal on ARS | (1) |  |  |  |  |  |  |  |  |  |  |  |  |
Total realized/unrealized gains | — |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2019 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |
Return of principal on ARS | (3) |  |  |  |  |  |  |  |  |  |  |  |  |
Total realized/unrealized gains |  |  |  |  |  |  |  |  |  |  |  |  |
Included in investment income | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Included in other comprehensive income | (4) |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2020 | $ | — |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amounts reported on the balance sheet for cash and cash equivalents, receivables, and accounts payable approximate fair value due to the short-term maturity of these instruments. See discussion on fair market values for Long-term Debt included within Note 12 below.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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