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Fair Values of Financial Instruments
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Values of Financial Instruments Fair Values of Financial Instruments
 
The fair values of “Cash and cash equivalents,” “Accounts receivable – net,” and “Accounts payable,” approximate carrying values because of the short maturity of these financial instruments. The carrying value of corporate-owned life insurance is recorded at cash surrender value and, accordingly, approximates fair value. There are no other assets or liabilities measured at fair value on a recurring basis at March 31, 2021 or December 31, 2020. The carrying amounts and estimated fair values, based on Level 1 inputs, of long-term debt consist of the following:

 March 31, 2021December 31, 2020
Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
 ($ in millions)
Long-term debt, including current maturities$(12,617)$(15,249)$(12,681)$(16,664)