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Fair Value Measurements, Recurring (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Total gross fair value, assets | $ 974 | $ 2,865
Effect of counterparty netting | (803) | (2,669)
Effect of cash collateral netting | (7) | (34)
Net carrying value on Balance Sheet, assets | 164 | 162
Liabilities: |  |
Environmental credit obligations | 6 | 13
Total gross fair value, liabilities | 837 | 2,700
Effect of counterparty netting | (803) | (2,669)
Effect of cash collateral netting | (12) | (12)
Net carrying value on Balance Sheet, liabilities | 22 | 19
Assets Held in Trust [Member] |  |
Assets: |  |
Investments of certain benefit plans | 69 | 69
Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 863 | 2,792
Effect of counterparty netting | (803) | (2,669)
Effect of cash collateral netting | (7) | (34)
Derivative contracts, net assets | 53 | 89
Cash collateral received not offset | 0 | 0
Liabilities: |  |
Derivative contracts | 815 | 2,681
Effect of counterparty netting | (803) | (2,669)
Effect of cash collateral netting | (12) | (12)
Derivative contracts, net liabilities | 0 | 0
Cash collateral paid not offset | (80) | (136)
Physical Purchase Contracts [Member] |  |
Assets: |  |
Derivative contracts | 9 |
Derivative contracts, net assets | 9 |
Liabilities: |  |
Derivative contracts | 5 | 5
Derivative contracts, net liabilities | 5 | 5
Foreign Currency Contracts [Member] |  |
Assets: |  |
Derivative contracts | 33 | 4
Derivative contracts, net assets | 33 | 4
Liabilities: |  |
Derivative contracts | 11 | 1
Derivative contracts, net liabilities | 11 | 1
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Total gross fair value, assets | 956 | 2,856
Liabilities: |  |
Environmental credit obligations | 0 | 0
Total gross fair value, liabilities | 826 | 2,682
Fair Value, Inputs, Level 1 [Member] | Assets Held in Trust [Member] |  |
Assets: |  |
Investments of certain benefit plans | 60 | 60
Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 863 | 2,792
Liabilities: |  |
Derivative contracts | 815 | 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 | 33 | 4
Liabilities: |  |
Derivative contracts | 11 | 1
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Total gross fair value, assets | 9 | 0
Liabilities: |  |
Environmental credit obligations | 6 | 13
Total gross fair value, liabilities | 11 | 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 | 9 |
Liabilities: |  |
Derivative contracts | 5 | 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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