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Fair Value Of Financial Instruments
6 Months Ended
Jun. 30, 2019
Fair Value Of Financial Instruments [Abstract]  
Fair Value Of Financial Instruments (8) Fair Value of Financial Instruments:

The following table summarizes the carrying amounts and estimated fair values for long-term debt at June 30, 2019 and December 31, 2018. For the other financial instruments including cash, accounts receivable, restricted cash, accounts payable and other current liabilities, the carrying amounts approximate fair value due to the relatively short maturities of those instruments.

The fair value of our long-term debt is estimated based upon quoted market prices at the reporting date for those financial instruments.

June 30, 2019

December 31, 2018

($ in millions)

Carrying Amount

Fair Value

Carrying Amount

Fair Value

Total debt

$

17,026

$

12,822

$

17,400

$

12,756