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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments Fair Value of Financial Instruments

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.

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:
 
 
 
June 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
 
$
10,665

 
10,583

 
10,681

 
10,089