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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Financial Assets And Liabilities Carried At Fair Value | A summary of financial assets and liabilities that are measured at fair value on a recurring basis were as follows ($ in millions):
| Year Ended December 31 |  | Quoted Prices in Active Market (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
2020: |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Available-for-sale debt securities | $ | 27 |  |  | $ | — |  |  | $ | 27 |  |  | $ | — |
Investment in equity securities | 176 |  |  | 6 |  |  | — |  |  | — |
Liabilities: |  |  |  |  |  |  |
Cross-currency swap derivative contracts | 622 |  |  | — |  |  | 622 |  |  | — |
Deferred compensation plans | 111 |  |  | — |  |  | 111 |  |  | — |
2019: |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Available-for-sale debt securities | $ | 34 |  |  | $ | — |  |  | $ | 34 |  |  | $ | — |
Investment in equity securities | 111 |  |  | — |  |  | — |  |  | — |
Cross-currency swap derivative contracts | 26 |  |  | — |  |  | 26 |  |  | — |
Liabilities: |  |  |  |  |  |  |
Cross-currency swap derivative contracts | 112 |  |  | — |  |  | 112 |  |  | — |
Deferred compensation plans | 70 |  |  | — |  |  | 70 |  |  | — |
Carrying Amounts And Fair Values Of Financial Instruments | The carrying amounts and fair values of the Company’s financial instruments as of December 31 were as follows ($ in millions):
| 2020 |  | 2019
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Assets: |  |  |  |  |  |  |
Available-for-sale debt securities | $ | 27 |  |  | $ | 27 |  |  | $ | 34 |  |  | $ | 34 |
Investment in equity securities | 176 |  |  | 176 |  |  | 111 |  |  | 111 |
Cross-currency swap derivative contracts | — |  |  | — |  |  | 26 |  |  | 26 |
Liabilities: |  |  |  |  |  |  |
Cross-currency swap derivative contracts | 622 |  |  | 622 |  |  | 112 |  |  | 112 |
Notes payable and current portion of long-term debt | 11 |  |  | 11 |  |  | 212 |  |  | 212 |
Long-term debt | 21,193 |  |  | 23,004 |  |  | 21,517 |  |  | 21,897 |

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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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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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