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Financial Instruments | 12 Months Ended
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Dec. 31, 2019
Financial Instruments |
Financial Instruments | Note 20—Financial Instruments Overview—The carrying amounts and fair values of our financial instruments were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019 | ​ | December 31, 2018 |
​ | ​ | Carrying | ​ | Fair | ​ | Carrying | ​ | Fair |
​ |  | amount |  | value |  | amount |  | value |
Cash and cash equivalents |  | $ | 1,790 | ​ | $ | 1,790 | ​ | $ | 2,160 | ​ | $ | 2,160 | ​
Restricted cash and cash equivalents | ​ | ​ | 558 | ​ | ​ | 558 | ​ | ​ | 429 | ​ | ​ | 429 | ​
Restricted investments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 123 | ​ | ​ | 123 | ​
Long-term debt, including current maturities | ​ | ​ | 9,261 | ​ | ​ | 8,976 | ​ | ​ | 9,978 | ​ | ​ | 9,212 | ​
Derivative instruments, assets | ​ | ​ | 1 | ​ | ​ | 1 | ​ | ​ | — | ​ | ​ | — | ​
Derivative instruments, liabilities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6 | ​ | ​ | 6 | ​
​ We estimated the fair value of each class of financial instruments, for which estimating fair value is practicable, by applying the following methods and assumptions: Cash and cash equivalents—The carrying amount of our cash and cash equivalents represents the historical cost, plus accrued interest. Our cash equivalents are primarily invested in short-term time deposits and money market funds. The carrying amount of our cash and cash equivalents approximates fair value because of the near-term maturities of the instruments. Restricted cash and cash equivalents—The carrying amount of our restricted cash and cash equivalents, which are subject to restrictions due to collateral requirements, legislation, regulation or court order approximates fair value due to the near-term maturities of the instruments in which the restricted balances are held. At December 31, 2019, the aggregate carrying amount of such restricted cash and cash equivalents was $558 million, recorded in current assets. At December 31, 2018, the aggregate carrying amount of such restricted cash and cash equivalents was $429 million, including $428 million and $1 million, recorded in current assets and other assets, respectively. Restricted investments—The carrying amount of our restricted investments, which are subject to restrictions due to court order or pledged for security of certain credit arrangements, approximates fair value because of the near-term maturities of the instruments. At December 31, 2018, the aggregate carrying amount of the restricted investments was $123 million, recorded in current assets. Debt—The carrying amount of our debt represents the principal amount, net of unamortized discounts, premiums, debt issue costs and fair value adjustments. We measured the estimated fair value of our debt using significant other observable inputs, representative of a Level 2 fair value measurement, including the terms and credit spreads for the instruments. Derivative instruments—The carrying amount of our derivative instruments represents the estimated fair value of such instruments. We measured the estimated fair value of our derivative instruments using significant other observable inputs, representative of a Level 2 fair value measurement, including the terms and credit spreads for the instruments.

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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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