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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Summary of Significant Accounting Policies |
Schedule of allowance for doubtful accounts |
|  | Balance at |  |  |  |  |  | Balance at |
(Millions of dollars) |  | beginning of year |  | Provision(1) |  | Net deductions(2) |  | end of year |
Allowance for Doubtful Accounts: |  |  |  |  |  |  |  |  |  |  |
Year Ended December 31, 2018 |  | $ | 29 |  | 7 |  | (3) |  | $ | 33 |
Year Ended December 31, 2017 |  | $ | 14 |  | 16 |  | (1) |  | $ | 29 |
Year Ended December 31, 2016 |  | $ | 21 |  | (1) |  | (6) |  | $ | 14 |
(1) During 2018, $7 million 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. (2) Includes write-offs net of recoveries and foreign currency translation adjustments.
Schedule of allowance for notes receivable |
|  | Balance at |  |  |  |  |  | Balance at |
(Millions of dollars) |  | beginning of year |  | Provision |  | Net deductions |  | end of year |
Allowance for Notes Receivable: |  |  |  |  |  |  |  |  |  |  |
Year Ended December 31, 2018 |  | $ | 16 |  | 1 |  | — |  | $ | 17 |
Year Ended December 31, 2017 |  | $ | 16 |  | — |  | — |  | $ | 16 |
Year Ended December 31, 2016 |  | $ | — |  | 16 |  | — |  | $ | 16 |
Schedule of changes in the carrying amount of goodwill |
|  |  | Pork |  |  | CT&M |  |  |  |
(Millions of dollars) |  |  | Segment |  |  | Segment |  |  | Total |
Balance as of December 31, 2016 |  | $ | 18 |  | $ | 1 |  | $ | 19 |
Acquisition |  |  | — |  |  | 3 |  |  | 3 |
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 |
Schedule of changes in the asset retirement obligation |
|  | Years ended December 31, |
(Millions of dollars) |  | 2018 |  | 2017 |
Beginning balance |  | $ | 22 |  | $ | 19 |
Accretion expense |  |  | 1 |  |  | 2 |
Liability for additional lagoons placed in service |  |  | — |  |  | 1 |
Ending balance |  | $ | 23 |  | $ | 22 |
Schedule of amounts paid for interest and income taxes |
|  | Years ended December 31, |
(Millions of dollars) |  | 2018 |  | 2017 |  | 2016 |
Interest, net of interest capitalized |  | $ | 43 |  | $ | 30 |  | $ | 29 |
Income taxes, net of refunds |  |  | 35 |  |  | 32 |  |  | 31 |

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