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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments Fair Value of Financial Instruments
Our financial instruments consist of cash, cash equivalents and restricted cash, accounts receivable, accounts payable, long-term debt, excluding finance lease and other obligations, and interest rate swap contracts. Due to their short-term nature, the carrying amounts of our cash, cash equivalents and restricted cash, accounts receivable and accounts payable approximate their fair values.

The three input levels in the hierarchy of fair value measurements defined by the FASB 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 financial liabilities as of June 30, 2021 and December 31, 2020:

  June 30, 2021December 31, 2020
 Input
Level
Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
 (Dollars in millions)
Long-term debt, excluding finance lease and other obligations2$30,848 32,085 31,542 33,217 
Interest rate swap contracts (see Note 10)
2$67 67 107 107