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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2023
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 at December 31:
 20232022
Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
 ($ in millions)
Long-term debt, including current maturities$(17,179)$(16,631)$(15,082)$(13,846)