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Fair Value Measurements, Recurring (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Total gross fair value, assets | $ 709 | $ 2,865
Effect of counterparty netting | (620) | (2,669)
Effect of cash collateral netting | (9) | (34)
Net carrying value on Balance Sheet, assets | 80 | 162
Liabilities: |  |
Environmental credit obligations | 3 | 13
Total gross fair value, liabilities | 742 | 2,700
Effect of counterparty netting | (620) | (2,669)
Effect of cash collateral netting | (109) | (12)
Net carrying value on Balance Sheet, liabilities | 13 | 19
Assets Held in Trust [Member] |  |
Assets: |  |
Investments of certain benefit plans | 71 | 69
Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 634 | 2,792
Effect of counterparty netting | (620) | (2,669)
Effect of cash collateral netting | (9) | (34)
Derivative contracts, net assets | 5 | 89
Cash collateral received not offset | 0 | 0
Liabilities: |  |
Derivative contracts | 729 | 2,681
Effect of counterparty netting | (620) | (2,669)
Effect of cash collateral netting | (109) | (12)
Derivative contracts, net liabilities | 0 | 0
Cash collateral paid not offset | (50) | (136)
Physical Purchase Contracts [Member] |  |
Assets: |  |
Derivative contracts | 2 |
Derivative contracts, net assets | 2 |
Liabilities: |  |
Derivative contracts | 4 | 5
Derivative contracts, net liabilities | 4 | 5
Foreign Currency Contracts [Member] |  |
Assets: |  |
Derivative contracts | 2 | 4
Derivative contracts, net assets | 2 | 4
Liabilities: |  |
Derivative contracts | 6 | 1
Derivative contracts, net liabilities | 6 | 1
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Total gross fair value, assets | 698 | 2,856
Liabilities: |  |
Environmental credit obligations | 0 | 0
Total gross fair value, liabilities | 735 | 2,682
Fair Value, Inputs, Level 1 [Member] | Assets Held in Trust [Member] |  |
Assets: |  |
Investments of certain benefit plans | 62 | 60
Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 634 | 2,792
Liabilities: |  |
Derivative contracts | 729 | 2,681
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 | 2 | 4
Liabilities: |  |
Derivative contracts | 6 | 1
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Total gross fair value, assets | 2 | 0
Liabilities: |  |
Environmental credit obligations | 3 | 13
Total gross fair value, liabilities | 7 | 18
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 | 2 |
Liabilities: |  |
Derivative contracts | 4 | 5
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 | 9 | 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 | 9 | 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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