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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Schedule of Fair Value of Investment Assets |
(Dollars in Millions) | June 30, 2018 |  | December 31, 2017
Certificates of Deposit and Commercial Paper | $ | 75 |  |  | $ | — |
Corporate Bonds | 57 |  |  | 61 |
Government Securities | 39 |  |  | 34 |
Total investments at fair value | $ | 171 |  |  | $ | 95 |
Schedule of Investment Maturities | These investments have the following maturities:
(Dollars in millions) | June 30, 2018 |  | December 31, 2017
Less than 1 year | $ | 82 |  |  | $ | 18 |
1 - 5 years | 16 |  |  | 11 |
5 - 10 years | 27 |  |  | 26 |
Greater than 10 years | 46 |  |  | 40 |
Total investments at fair value | $ | 171 |  |  | $ | 95 |
Schedule of Fair Value and Carrying Value of Long-Term Debt | The fair value and carrying value of the Company's long-term debt is as follows:
(Dollars in millions) | June 30, 2018 |  | December 31, 2017
Long-term Debt (Including Current Maturities): |  |  |
Fair Value | $ | 14,069 |  |  | $ | 13,220 |
Carrying Value | 13,788 |  |  | 11,809 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 3: 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=99377789&loc=d3e19207-110258 + Details
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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=109250915&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=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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