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Fair Value Measurements (Notes)
3 Months Ended
Mar. 31, 2021
Fair Value Measurements [Abstract]  
Fair Value Measurements Fair Value Measurements
Accounting guidance establishes a three-level hierarchy for disclosure of fair value measurements, based on the transparency of inputs to the valuation of an asset or liability as of the measurement date, as follows:

Level 1 – inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets.
Level 2 – inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument.
Level 3 – inputs to the valuation methodology are unobservable and significant to the fair value measurement.

Financial Assets and Liabilities

The Company has estimated the fair value of its financial instruments as of March 31, 2021 and December 31, 2020 using available market information or other appropriate valuation methodologies. Considerable judgment, however, is required in interpreting market data to develop the estimates of fair value. Accordingly, the estimates presented in the accompanying consolidated financial statements are not necessarily indicative of the amounts the Company would realize in a current market exchange.

The carrying amounts of cash and cash equivalents, receivables, payables and other current assets and liabilities approximate fair value because of the short maturity of those instruments.

As of March 31, 2021 and December 31, 2020, accounts receivable, net on the consolidated balance sheets includes approximately $344 million and $338 million of current equipment installment plan receivables, respectively, and other noncurrent assets includes approximately $168 million and $134 million of noncurrent equipment installment plan receivables, respectively.

Financial instruments accounted for at fair value on a recurring basis and classified within Level 2 of the valuation hierarchy include the Company's cross-currency derivative instruments and were valued at $121 million and $184 million as of March 31, 2021 and December 31, 2020, respectively.

The estimated fair value of the Company’s senior notes and debentures as of March 31, 2021 and December 31, 2020 is based on quoted market prices in active markets and is classified within Level 1 of the valuation hierarchy, while the estimated fair value of the Company’s credit facilities is based on quoted market prices in inactive markets and is classified within Level 2. The carrying amount of the consolidated variable interest entity's mortgage note liability approximates fair value.
A summary of the carrying value and fair value of debt as of March 31, 2021 and December 31, 2020 is as follows:

March 31, 2021December 31, 2020
Carrying ValueFair ValueCarrying ValueFair Value
Senior notes and debentures$74,872 $82,191 $72,671 $84,163 
Credit facilities$10,015 $10,032 $10,081 $10,063 

Nonfinancial Assets and Liabilities
The Company’s nonfinancial assets such as equity-method investments, franchises, property, plant, and equipment, and other intangible assets are not measured at fair value on a recurring basis; however, they are subject to fair value adjustments in certain circumstances, such as when there is evidence that an impairment may exist.  When such impairments are recorded, fair values are generally classified within Level 3 of the valuation hierarchy.