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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Summary of Significant Accounting Policies |
Schedule of allowance for doubtful accounts | ​
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​ |  | Balance at |  | ​ |  | ​ |  | Balance at |
(Millions of dollars) | ​ | beginning of year | ​ | Provision(a) | ​ | Net deductions(b) | ​ | end of year |
Allowance for Doubtful Accounts: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year Ended December 31, 2019 | ​ | $ | 33 |  | 5 |  | (10) | ​ | $ | 28 | ​
Year Ended December 31, 2018 | ​ | $ | 29 |  | 7 |  | (3) | ​ | $ | 33 | ​
Year Ended December 31, 2017 | ​ | $ | 14 |  | 16 |  | (1) | ​ | $ | 29 | ​
​ (a)During 2019 and 2018, $5 million and $7 million, respectively, of the provision was charged to selling, general and administrative expenses. During 2017, $12 million of the provision was charged to selling, general and administrative expenses, $2 million to income from affiliates related to reserves on convertible notes and $2 million to cost of sales related to a rebate reserve. (b)Includes write-offs net of recoveries, foreign currency translation adjustments and other adjustments. ​
Schedule of allowance for notes receivable | ​
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​ |  | Balance at |  | ​ |  | ​ |  | Balance at |
(Millions of dollars) | ​ | beginning of year | ​ | Provision | ​ | Net deductions | ​ | end of year |
Allowance for Notes Receivable: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year Ended December 31, 2019 | ​ | $ | 17 |  | — |  | — | ​ | $ | 17 | ​
Year Ended December 31, 2018 | ​ | $ | 16 |  | 1 |  | — | ​ | $ | 17 | ​
Year Ended December 31, 2017 | ​ | $ | 16 |  | — |  | — | ​ | $ | 16 | ​
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Schedule of changes in the carrying amount of goodwill | ​
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​ | ​ | ​ | Pork | ​ | ​ | CT&M | ​ | ​ | ​
(Millions of dollars) |  | ​ | Segment |  | ​ | Segment | ​ | ​ | Total
Balance as of December 31, 2017 | ​ | $ | 18 | ​ | $ | 4 | ​ | $ | 22
Acquisition | ​ | ​ | — | ​ | ​ | 148 | ​ | ​ | 148
Foreign currency translation | ​ |  | — | ​ |  | (3) | ​ | ​ | (3)
Balance as of December 31, 2018 | ​ | ​ | 18 | ​ | ​ | 149 | ​ | ​ | 167
Acquisition | ​ | ​ | — | ​ | ​ | 1 | ​ | ​ | 1
Foreign currency translation | ​ |  | — | ​ |  | (4) | ​ | ​ | (4)
Balance as of December 31, 2019 | ​ | $ | 18 | ​ | $ | 146 | ​ | $ | 164
Schedule of gross carrying amount and accumulated amortization for finite-lived intangibles | ​
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​ | ​ | December 31, 2019 | ​ | ​ | December 31, 2018 | ​
​ | ​ | Customer | ​ | Trade | ​ | ​ | ​ | ​ | Customer | ​ | Trade | ​ | ​ | ​
(Millions of dollars) | ​ | relationships | ​ | names | ​ | Total | ​ | ​ | relationships | ​ | names | ​ | Total | ​
Gross carrying amount | $ | 50 | $ | 28 | $ | 78 | ​ | $ | 50 | $ | 28 | $ | 78 | ​
Accumulated amortization and currency translation | ​ | (13) | ​ | (7) | ​ | (20) | ​ | ​ | (6) | ​ | (3) | ​ | (9) | ​
Net carrying amount | $ | 37 | $ | 21 | $ | 58 | ​ | $ | 44 | $ | 25 | $ | 69 | ​
Schedule of changes in the asset retirement obligation | ​
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​ | ​ | Years ended December 31,
(Millions of dollars) |  | 2019 |  | 2018
Beginning balance | ​ | $ | 23 | ​ | $ | 22
Accretion expense | ​ |  | 2 | ​ |  | 1
Ending balance | ​ | $ | 25 | ​ | $ | 23

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