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Fair Values of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 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:
| September 30, 2023 |  | December 31, 2022
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
| ($ in millions)
Long-term debt, including current maturities | $ | (16,584) |  |  | $ | (14,405) |  |  | $ | (15,082) |  |  | $ | (13,846) |

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