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Fair Values of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Carrying Amounts and Estimated Fair Values The carrying amounts and estimated fair values, based on Level 1 inputs, of long-term debt consist of the following:
 September 30, 2024December 31, 2023
Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
 ($ in millions)
Long-term debt, including current maturities$(17,199)$(16,654)$(17,179)$(16,631)