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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
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:
| 2020 |  | 2019
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
| ($ in millions)
Long-term debt, including current maturities | $ | (12,681) |  |  | $ | (16,664) |  |  | $ | (12,196) |  |  | $ | (14,806) |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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