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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2021
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] | In accordance with the provisions of ASC 820, the following tables provide the valuation hierarchy classification of assets and liabilities that are carried at fair value and measured on a recurring basis in our Condensed Consolidated Balance Sheet as of March 31, 2021 and December 31, 2020:
| March 31, 2021
(dollars in millions) | Total |  | Level 1 |  | Level 2 |  | Level 3
Recurring fair value measurements: |  |  |  |  |  |  |
Marketable securities held in trusts | $ | 879 |  |  | $ | 813 |  |  | $ | 66 |  |  | $ | — |
Derivative assets | 193 |  |  | — |  |  | 193 |  |  | — |
Derivative liabilities | (167) |  |  | — |  |  | (167) |  |  | — |
| December 31, 2020
(dollars in millions) | Total |  | Level 1 |  | Level 2 |  | Level 3
Recurring fair value measurements: |  |  |  |  |  |  |
Marketable securities held in trusts | $ | 881 |  |  | $ | 773 |  |  | $ | 108 |  |  | $ | — |
Derivative assets | 241 |  |  | — |  |  | 241 |  |  | — |
Derivative liabilities | (98) |  |  | — |  |  | (98) |  |  | — |
Fair Value, by Balance Sheet Grouping [Table Text Block] | The following table provides carrying amounts and fair values of financial instruments that are not carried at fair value in our Condensed Consolidated Balance Sheet at March 31, 2021 and December 31, 2020:
| March 31, 2021 |  | December 31, 2020
(dollars in millions) | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Customer financing notes receivable | $ | 313 |  |  | $ | 303 |  |  | $ | 271 |  |  | $ | 264 |
Short-term borrowings | (234) |  |  | (234) |  |  | (247) |  |  | (247) |
Long-term debt (excluding finance leases) | (31,200) |  |  | (35,633) |  |  | (31,512) |  |  | (38,615) |
Long-term liabilities | (28) |  |  | (27) |  |  | (27) |  |  | (25) |
The following table provides the valuation hierarchy classification of assets and liabilities that are not carried at fair value in our Condensed Consolidated Balance Sheet at March 31, 2021 and December 31, 2020:
| March 31, 2021
(dollars in millions) | Total |  | Level 1 |  | Level 2 |  | Level 3
Customer financing notes receivable | $ | 303 |  |  | $ | — |  |  | $ | 303 |  |  | $ | — |
Short-term borrowings | (234) |  |  | — |  |  | (160) |  |  | (74) |
Long-term debt (excluding finance leases) | (35,633) |  |  | — |  |  | (35,559) |  |  | (74) |
Long-term liabilities | (27) |  |  | — |  |  | (27) |  |  | — |
| December 31, 2020
(dollars in millions) | Total |  | Level 1 |  | Level 2 |  | Level 3
Customer financing notes receivable | $ | 264 |  |  | $ | — |  |  | $ | 264 |  |  | $ | — |
Short-term borrowings | (247) |  |  | — |  |  | (160) |  |  | (87) |
Long-term debt (excluding finance leases) | (38,615) |  |  | — |  |  | (38,540) |  |  | (75) |
Long-term liabilities | (25) |  |  | — |  |  | (25) |  |  | — |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + 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=117815213&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 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: 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 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&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=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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