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Assets and Liabilities Measured at Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Schedule of Assets Measured at Fair Value on Recurring Basis | The following tables summarize our assets and liabilities measured at fair value on a recurring basis as of December 31, 2020 and 2019, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):
|  | December 31, 2020 |
|  | Fair Value |  |  | Fair Value Measurements Using |
|  | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments of insurance subsidiaries: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | $ | 416 |  |  | $ | — |  |  | $ | 416 |  |  | $ | — |
Money market funds and other |  |  | 88 |  |  |  | 88 |  |  |  | — |  |  |  | — |
Investments of insurance subsidiaries |  |  | 504 |  |  |  | 88 |  |  |  | 416 |  |  |  | — |
Less amounts classified as current assets |  |  | (116 | ) |  |  | (87 | ) |  |  | (29 | ) |  |  | — |
|  | $ | 388 |  |  |  | 1 |  |  | $ | 387 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps (Income taxes and other liabilities) |  | $ | 46 |  |  | $ | — |  |  | $ | 46 |  |  | $ | — |
|  | December 31, 2019 |
|  | Fair Value |  |  | Fair Value Measurements Using |
|  | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments of insurance subsidiaries: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | $ | 377 |  |  | $ | — |  |  | $ | 377 |  |  | $ | — |
Money market funds and other |  |  | 85 |  |  |  | 85 |  |  |  | — |  |  |  | — |
Investments of insurance subsidiaries |  |  | 462 |  |  |  | 85 |  |  |  | 377 |  |  |  | — |
Less amounts classified as current assets |  |  | (147 | ) |  |  | (83 | ) |  |  | (64 | ) |  |  | — |
|  | $ | 315 |  |  |  | 2 |  |  | $ | 313 |  |  | $ | — |
Interest rate swaps (Other) |  | $ | 3 |  |  | $ | — |  |  | $ | 3 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps (Income taxes and other liabilities) |  | $ | 7 |  |  | $ | — |  |  | $ | 7 |  |  | $ | — |

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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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