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Fair Value of Financial Instruments
3 Months Ended
Mar. 31, 2020
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 Fair Value Measurement and Disclosure framework are generally as follows:
Input Level
 
Description of Input
Level 1
 
Observable inputs such as quoted market prices in active markets.
Level 2
 
Inputs other than quoted prices in active markets that are either directly or indirectly observable.
Level 3
 
Unobservable 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 March 31, 2020 and December 31, 2019:
 
 
 
March 31, 2020
 
December 31, 2019
 
Input
Level
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
 
 
(Dollars in millions)
Long-term debt, excluding finance lease and other obligations
2
 
$
34,405

 
33,117

 
34,472

 
35,737

Interest rate swap contracts (see Note 10)
2
 
152

 
152

 
51

 
51