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Derivatives and Fair Value of Financial Instruments - Instruments and Agreements (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) item agreement | Apr. 02, 2016 USD ($) agreement item | Dec. 31, 2017 USD ($) item agreement | Dec. 31, 2016 USD ($) item agreement | Dec. 31, 2015 USD ($) agreement item | Dec. 31, 2010 USD ($) agreement | Dec. 31, 2015 agreement
Commodities |  |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivatives | $ |  |  | $ (9) | $ 21 | $ (45) |  |
Net commodity purchase contracts | Hogs |  |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |  |
Nonmonetary notional amount |  |  |  | 14,000,000 |  |  |
Net commodity purchase contracts | Grain |  |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |  |
Nonmonetary notional amount | 29,000,000 |  | 29,000,000 | 22,000,000 |  |  |
Net commodity purchase contracts | Soybean oil |  |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |  |
Nonmonetary notional amount | 1,000,000 |  | 1,000,000 |  |  |  |
Net commodity sale contracts | Hogs |  |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |  |
Nonmonetary notional amount | 13,000,000 |  | 13,000,000 |  |  |  |
Net commodity sale contracts | Heating oil |  |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |  |
Nonmonetary notional amount | 7,000,000 |  | 7,000,000 | 4,000,000 |  |  |
Net commodity sale contracts | Soybean oil |  |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |  |
Nonmonetary notional amount |  |  |  | 35,000,000 |  |  |
Foreign currencies |  |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |  |
Notional amounts | $ | $ 20 |  | $ 20 | $ 81 |  |  |
Interest rate swaps |  |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |  |
Notional amounts | $ |  |  |  | $ 75 |  | $ 25 |
Number of derivative instruments entered into | agreement |  |  |  |  |  | 3 |
Number of derivative agreements | agreement |  |  |  | 3 |  |  |
Number of derivative agreements terminated | agreement | 3 |  | 3 |  |  |  |
Term of derivative contract |  |  |  |  |  | 10 years |
Payments to unwind interest rate exchange agreements | $ | $ 2 |  |  |  |  |  |
Eight-year interest rate exchange agreements |  |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |  |
Notional amounts | $ |  | $ 44 |  |  |  |  |
Number of derivative instruments entered into | agreement |  |  |  |  |  |  | 4
Number of derivative agreements terminated | agreement |  | 2 |  |  |  |  |
Term of derivative contract |  |  |  |  |  |  | 8 years
Number of agreements terminated and not renewed | agreement |  |  |  |  | 2 |  |
Number of bulk vessels delivered |  | 2 |  |  | 2 |  |
Payments to unwind interest rate exchange agreements | $ |  | $ 2 |  |  |  |  |

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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