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Fair Value Of Financial Instruments
3 Months Ended
Mar. 31, 2021
Fair Value Of Financial Instruments [Abstract]  
Fair Value Of Financial Instruments (9) Fair Value of Financial Instruments:

The following table summarizes the carrying amounts and estimated fair values for long-term debt at March 31, 2021 and December 31, 2020. 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 (including $10,949 million of debt classified in Liabilities subject to compromise at March 31, 2021) is estimated based upon quoted market prices at the reporting date for those financial instruments.

March 31, 2021

December 31, 2020

($ in millions)

Carrying Amount

Fair Value

Carrying Amount

Fair Value

Total debt

$

16,769 

$

13,354 

$

16,769 

$

11,635