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Derivative Instruments and Hedging Activities (Narrative) (Details) gal in Millions, bu in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) gal bu | Dec. 31, 2019 USD ($) | Mar. 31, 2020 bu
Derivative [Line Items] |  |  |
Derivatives used in Net Investment Hedge, Net of Tax | $ (202) | $ 6 |
Unrealized gain (loss) on interest rate cash flow hedges, after-tax, AOCI | 31 | (43) |
Notional Amount of Nonderivative Instruments | 1,500 | 1,700 |
Foreign Debt used in Net Investment Hedge, Net of Tax | 87 | (7) |
Gain (Loss) on Foreign Currency Fair Value Hedge Derivatives | 8 |  |
Designated As Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Interest Rate Derivative Assets, at Fair Value | 61 | 3 |
Interest Rate Derivative Liabilities, at Fair Value | 15 | 43 |
After-tax gain (losses) in AOCI from commodity cash flow hedge transactions | 119 | (5) |
After-tax gain (losses) in AOCI from commodity cash flow hedge transactions expected to be recognized in earnings. | $ 119 |  |
Corn processed per month (in bushels) | bu | 56 |  | 72
Soybean [Member] | Minimum [Member] | Designated As Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Percentage of Anticipated Commodity Hedged During Historical Hedging Period | 27.00% |  |
Percentage of Anticipated Commodity Hedged over Future Hedging Period | 0.00% |  |
Soybean [Member] | Maximum [Member] | Designated As Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Percentage of Anticipated Commodity Hedged During Historical Hedging Period | 100.00% |  |
Percentage of Anticipated Commodity Hedged over Future Hedging Period | 100.00% |  |
Fair Value Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Liability, Notional Amount |  | 496 |
Fair Value Hedging [Member] | Designated As Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Interest Rate Derivative Assets, at Fair Value |  | 3 |
Currency Swap [Member] | Net Investment Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Liability, Notional Amount | $ 1,300 | 1,200 |
Corn [Member] | Designated As Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Maximum Length of Time Hedged in Price Risk Cash Flow Hedge | 12 months |  |
Corn [Member] | Minimum [Member] | Designated As Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Percentage of Anticipated Commodity Hedged During Historical Hedging Period | 20.00% |  |
Percentage of Anticipated Commodity Hedged over Future Hedging Period | 20.00% |  |
Corn [Member] | Maximum [Member] | Designated As Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Percentage of Anticipated Commodity Hedged During Historical Hedging Period | 38.00% |  |
Percentage of Anticipated Commodity Hedged over Future Hedging Period | 33.00% |  |
Foreign Exchange Forward [Member] | Net Investment Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Liability, Notional Amount | $ 1,800 |  |
Interest Rate Swap [Member] | Cash Flow Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Liability, Notional Amount | 3,300 | $ 4,700 |
Derivative Asset, Notional Amount | $ 550 |  |
Ethanol [Member] | Designated As Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Contracted commodity sales volume hedged over future hedging period (in gallons) | gal | 0 |  |
Ethanol [Member] | Minimum [Member] | Designated As Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Commodity sales volume hedged during historical hedging period (in gallons) | gal | 0 |  |
Ethanol [Member] | Maximum [Member] | Designated As Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Commodity sales volume hedged during historical hedging period (in gallons) | gal | 28 |  |

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