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Fair Value Measurements, Recurring (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Total gross fair value, assets | $ 885 | $ 498
Effect of counterparty netting | (677) | (373)
Effect of cash collateral netting | (48) | (18)
Net carrying value on Balance Sheet, assets | 160 | 107
Liabilities |  |
Environmental credit obligations | 94 | 96
Total gross fair value, liabilities | 840 | 505
Effect of counterparty netting | (677) | (373)
Effect of cash collateral netting | (59) | (32)
Net carrying value on Balance Sheet, liabilities | 104 | 100
Assets Held in Trust [Member] |  |
Assets |  |
Investments of certain benefit plans | 90 | 82
Commodity Contracts [Member] |  |
Assets |  |
Derivative contracts | 785 | 403
Effect of counterparty netting | (677) | (373)
Effect of cash collateral netting | (48) | (18)
Derivative contracts, net assets | 60 | 12
Cash collateral received not offset | 0 | 0
Liabilities |  |
Derivative contracts | 736 | 405
Effect of counterparty netting | (677) | (373)
Effect of cash collateral netting | (59) | (32)
Derivative contracts, net liabilities | 0 | 0
Cash collateral paid not offset | (55) | (44)
Physical Purchase Contracts [Member] |  |
Assets |  |
Derivative contracts | 6 | 13
Derivative contracts, net assets | 6 | 13
Liabilities |  |
Derivative contracts | 5 |
Derivative contracts, net liabilities | 5 |
Foreign Currency Contracts [Member] |  |
Assets |  |
Derivative contracts | 4 |
Derivative contracts, net assets | 4 |
Liabilities |  |
Derivative contracts | 5 | 4
Derivative contracts, net liabilities | 5 | 4
Fair Value, Inputs, Level 1 [Member] |  |
Assets |  |
Total gross fair value, assets | 873 | 477
Liabilities |  |
Environmental credit obligations | 0 | 0
Total gross fair value, liabilities | 741 | 409
Fair Value, Inputs, Level 1 [Member] | Assets Held in Trust [Member] |  |
Assets |  |
Investments of certain benefit plans | 84 | 74
Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member] |  |
Assets |  |
Derivative contracts | 785 | 403
Liabilities |  |
Derivative contracts | 736 | 405
Fair Value, Inputs, Level 1 [Member] | Physical Purchase Contracts [Member] |  |
Assets |  |
Derivative contracts | 0 | 0
Liabilities |  |
Derivative contracts | 0 |
Fair Value, Inputs, Level 1 [Member] | Foreign Currency Contracts [Member] |  |
Assets |  |
Derivative contracts | 4 |
Liabilities |  |
Derivative contracts | 5 | 4
Fair Value, Inputs, Level 2 [Member] |  |
Assets |  |
Total gross fair value, assets | 6 | 13
Liabilities |  |
Environmental credit obligations | 94 | 96
Total gross fair value, liabilities | 99 | 96
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 | 6 | 13
Liabilities |  |
Derivative contracts | 5 |
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contracts [Member] |  |
Assets |  |
Derivative contracts | 0 |
Liabilities |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Assets |  |
Total gross fair value, assets | 6 | 8
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 | 6 | 8
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 | 0
Liabilities |  |
Derivative contracts | 0 |
Fair Value, Inputs, Level 3 [Member] | Foreign Currency Contracts [Member] |  |
Assets |  |
Derivative contracts | 0 |
Liabilities |  |
Derivative contracts | $ 0 | $ 0

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