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Fair Value (Tables)
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Carrying Amount and Estimated Fair Value of Financial Instruments
The carrying amounts and estimated fair values of all other financial instruments are as follows:
 
December 31, 2018
 
Carrying Amount
 
Estimated Fair Value
Debt
 
 
 
Total debt
$
2,141

 
$
2,091