Derivative Instruments (Details 4) (Details) - USD ($) $ in Millions |
3 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
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| Summary of Derivative Instruments by Risk Exposure [Abstract] | ||||||||||||||
| Gain (Loss) on Derivative Instruments, Net, Pretax | [1] | $ 174 | $ 156 | |||||||||||
| Gain (Loss) on Sale of Derivatives | [2],[3] | (3) | 111 | |||||||||||
| Mark-to-market gain (loss) | [4] | 177 | 45 | |||||||||||
| Sales [Member] | ||||||||||||||
| Summary of Derivative Instruments by Risk Exposure [Abstract] | ||||||||||||||
| Gain (Loss) on Derivative Instruments, Net, Pretax | [1],[5],[6] | 507 | 37 | |||||||||||
| Cost of Sales [Member] | ||||||||||||||
| Summary of Derivative Instruments by Risk Exposure [Abstract] | ||||||||||||||
| Gain (Loss) on Derivative Instruments, Net, Pretax | [1],[5],[6] | (309) | 120 | |||||||||||
| Interest Expense [Member] | ||||||||||||||
| Summary of Derivative Instruments by Risk Exposure [Abstract] | ||||||||||||||
| Gain (Loss) on Derivative Instruments, Net, Pretax | [1] | (24) | (1) | |||||||||||
| Interest rate hedging instruments | ||||||||||||||
| Summary of Derivative Instruments by Risk Exposure [Abstract] | ||||||||||||||
| Mark-to-market gain (loss) | [4] | (24) | (1) | |||||||||||
| Energy Related Derivative | ||||||||||||||
| Summary of Derivative Instruments by Risk Exposure [Abstract] | ||||||||||||||
| Gain (Loss) on Sale of Derivatives | [2],[3] | (3) | 111 | |||||||||||
| Mark-to-market gain (loss) | [4] | $ 201 | $ 46 | |||||||||||
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