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Fair Value of Financial Instruments
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments Fair Value of Financial Instruments
Our financial instruments consist of cash and cash equivalents, restricted cash, accounts receivable, accounts payable, note receivable-affiliate and long-term debt, excluding finance lease and other obligations. Due to their short-term nature, the carrying amounts of our cash and cash equivalents, restricted cash, accounts receivable, note receivable-affiliate and accounts payable approximate their fair values.

The three input levels in the hierarchy of fair value measurements are defined by the FASB are generally as follows:
Input LevelDescription of Input
Level 1Observable inputs such as quoted market prices in active markets.
Level 2Inputs other than quoted prices in active markets that are either directly or indirectly observable.
Level 3Unobservable inputs in which little or no market data exists.
The following table presents the carrying amounts and estimated fair values of our long-term debt, excluding finance leases, as well as the input level used to determine the fair values indicated below:
March 31, 2021December 31, 2020
Input LevelCarrying AmountFair ValueCarrying AmountFair Value
(Dollars in millions)
Liabilities-Long-term debt, excluding finance leases2$10,103 10,212 10,132 10,340