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Fair Value Measurements, Recurring (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Total gross fair value, assets | $ 758 | $ 718
Effect of counterparty netting | (506) | (612)
Effect of cash collateral netting | (38) | 0
Net carrying value on Balance Sheet, assets | 214 | 106
Liabilities |  |
Environmental credit obligations | 38 | 2
Total gross fair value, liabilities | 568 | 683
Effect of counterparty netting | (506) | (612)
Effect of cash collateral netting | (13) | (56)
Net carrying value on Balance Sheet, liabilities | 49 | 15
Assets Held in Trust [Member] |  |
Assets |  |
Investments of certain benefit plans | 73 | 74
Commodity Contracts [Member] |  |
Assets |  |
Derivative contracts | 656 | 617
Effect of counterparty netting | (506) | (612)
Effect of cash collateral netting | (38) | 0
Derivative contracts, net assets | 112 | 5
Cash collateral received not offset | 0 | 0
Liabilities |  |
Derivative contracts | 519 | 668
Effect of counterparty netting | (506) | (612)
Effect of cash collateral netting | (13) | (56)
Derivative contracts, net liabilities | 0 | 0
Cash collateral paid not offset | (38) | (84)
Physical Purchase Contracts [Member] |  |
Assets |  |
Derivative contracts | 1 |
Derivative contracts, net assets | 1 |
Liabilities |  |
Derivative contracts | 2 | 3
Derivative contracts, net liabilities | 2 | 3
Foreign Currency Contracts [Member] |  |
Assets |  |
Derivative contracts | 28 | 27
Derivative contracts, net assets | 28 | 27
Liabilities |  |
Derivative contracts | 9 | 10
Derivative contracts, net liabilities | 9 | 10
Fair Value, Inputs, Level 1 [Member] |  |
Assets |  |
Total gross fair value, assets | 749 | 709
Liabilities |  |
Environmental credit obligations | 0 | 0
Total gross fair value, liabilities | 528 | 678
Fair Value, Inputs, Level 1 [Member] | Assets Held in Trust [Member] |  |
Assets |  |
Investments of certain benefit plans | 65 | 65
Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member] |  |
Assets |  |
Derivative contracts | 656 | 617
Liabilities |  |
Derivative contracts | 519 | 668
Fair Value, Inputs, Level 1 [Member] | Physical Purchase Contracts [Member] |  |
Assets |  |
Derivative contracts | 0 |
Liabilities |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Foreign Currency Contracts [Member] |  |
Assets |  |
Derivative contracts | 28 | 27
Liabilities |  |
Derivative contracts | 9 | 10
Fair Value, Inputs, Level 2 [Member] |  |
Assets |  |
Total gross fair value, assets | 1 | 0
Liabilities |  |
Environmental credit obligations | 38 | 2
Total gross fair value, liabilities | 40 | 5
Fair Value, Inputs, Level 2 [Member] | Assets Held in Trust [Member] |  |
Assets |  |
Investments of certain benefit plans | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Commodity Contracts [Member] |  |
Assets |  |
Derivative contracts | 0 | 0
Liabilities |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Physical Purchase Contracts [Member] |  |
Assets |  |
Derivative contracts | 1 |
Liabilities |  |
Derivative contracts | 2 | 3
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contracts [Member] |  |
Assets |  |
Derivative contracts | 0 | 0
Liabilities |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Assets |  |
Total gross fair value, assets | 8 | 9
Liabilities |  |
Environmental credit obligations | 0 | 0
Total gross fair value, liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Assets Held in Trust [Member] |  |
Assets |  |
Investments of certain benefit plans | 8 | 9
Fair Value, Inputs, Level 3 [Member] | Commodity Contracts [Member] |  |
Assets |  |
Derivative contracts | 0 | 0
Liabilities |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Physical Purchase Contracts [Member] |  |
Assets |  |
Derivative contracts | 0 |
Liabilities |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Foreign Currency Contracts [Member] |  |
Assets |  |
Derivative contracts | 0 | 0
Liabilities |  |
Derivative contracts | $ 0 | $ 0

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