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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2021
Fair Value Disclosures [Abstract] |
Carrying Values and Fair Values of Non-Current Financial Assets and Liabilities | We present the carrying values and the fair values of noncurrent financial assets and liabilities that qualify as financial instruments, determined under current guidance for disclosures on the fair value of financial instruments, in the following table:
| March 31, 2021 |  | December 31, 2020
($ in millions) | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Senior, mezzanine, and other loans | $ | 162 |  |  | $ | 146 |  |  | $ | 159 |  |  | $ | 142 |
Total noncurrent financial assets | $ | 162 |  |  | $ | 146 |  |  | $ | 159 |  |  | $ | 142 |
Senior Notes | $ | (8,716) |  |  | $ | (9,404) |  |  | $ | (8,031) |  |  | $ | (8,941) |
Commercial paper / Credit Facility | (400) |  |  | (400) |  |  | (900) |  |  | (900) |
Other long-term debt | (126) |  |  | (128) |  |  | (126) |  |  | (128) |
Other noncurrent liabilities | (426) |  |  | (426) |  |  | (426) |  |  | (426) |
Total noncurrent financial liabilities | $ | (9,668) |  |  | $ | (10,358) |  |  | $ | (9,483) |  |  | $ | (10,395) |

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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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