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Fair Value Disclosure
9 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Fair Value Disclosure Fair Value Disclosure

The Fair Value Measurement and Disclosure framework provides a three-tiered fair value hierarchy based on the reliability of the inputs used to determine fair value. Input Level 1 refers to fair values determined based on quoted prices in active markets for identical assets. Input Level 2 refers to fair values estimated using significant other observable inputs and Input Level 3 includes fair values estimated using significant unobservable inputs.
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 following table presents the carrying amounts and estimated fair values of our long-term debt, excluding finance lease and other obligations, as well as the input level used to determine the fair values indicated below:
 
 
 
September 30, 2019
 
December 31, 2018
 
Input
Level
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
 
 
(Dollars in millions)
Liabilities—Long-term debt (excluding finance lease and other obligations)
2
 
$
5,941

 
6,226

 
5,938

 
5,118