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Fair Value Measurements, Recurring (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Mar. 31, 2017 | Mar. 31, 2016
--- | --- | ---
Assets: |  |
Investments of certain benefit plans | $ 70 | $ 69
Total gross fair value, assets | 743 | 984
Effect of Counterparty Netting | (637) | (875)
Effect of Cash Collateral Netting | 0 | 0
Net Carrying Value on Balance Sheet, Assets | 106 | 109
Liabilities: |  |
Environmental credit obligations | 289 | 188
Total gross fair value, liabilities | 939 | 1,088
Effect of Counterparty Netting | (637) | (875)
Effect of Cash Collateral Netting | (8) | (20)
Net Carrying Value on Balance Sheet, Liabilities | 294 | 193
Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 673 | 912
Effect of Counterparty Netting | (637) | (875)
Effect of Cash Collateral Netting | 0 | 0
Derivative contracts, net assets | 36 | 37
Cash Collateral Received Not Offset | 0 | 0
Liabilities: |  |
Derivative contracts | 645 | 895
Effect of Counterparty Netting | (637) | (875)
Effect of Cash Collateral Netting | (8) | (20)
Derivative contracts, net liabilities | 0 | 0
Cash Collateral Paid Not Offset | (61) | (88)
Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | 3 | 5
Derivative contracts, net liabilities | 3 | 5
Foreign Currency Contracts [Member] |  |
Assets: |  |
Derivative contracts |  | 3
Derivative contracts, net assets |  | 3
Liabilities: |  |
Derivative contracts | 2 |
Derivative contracts, net liabilities | 2 |
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Investments of certain benefit plans | 59 | 58
Total gross fair value, assets | 720 | 935
Liabilities: |  |
Environmental credit obligations | 0 | 0
Total gross fair value, liabilities | 638 | 872
Fair Value, Inputs, Level 1 [Member] | Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 661 | 874
Liabilities: |  |
Derivative contracts | 636 | 872
Fair Value, Inputs, Level 1 [Member] | Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Foreign Currency Contracts [Member] |  |
Assets: |  |
Derivative contracts |  | 3
Liabilities: |  |
Derivative contracts | 2 |
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Investments of certain benefit plans | 0 | 0
Total gross fair value, assets | 12 | 38
Liabilities: |  |
Environmental credit obligations | 289 | 188
Total gross fair value, liabilities | 301 | 216
Fair Value, Inputs, Level 2 [Member] | Commodity Contracts [Member] |  |
Assets: |  |
Derivative contracts | 12 | 38
Liabilities: |  |
Derivative contracts | 9 | 23
Fair Value, Inputs, Level 2 [Member] | Physical Purchase Contracts [Member] |  |
Liabilities: |  |
Derivative contracts | 3 | 5
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contracts [Member] |  |
Assets: |  |
Derivative contracts |  | 0
Liabilities: |  |
Derivative contracts | 0 |
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Investments of certain benefit plans | 11 | 11
Total gross fair value, assets | 11 | 11
Liabilities: |  |
Environmental credit obligations | 0 | 0
Total gross fair value, liabilities | 0 | 0
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] |  |
Liabilities: |  |
Derivative contracts | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Foreign Currency Contracts [Member] |  |
Assets: |  |
Derivative contracts |  | $ 0
Liabilities: |  |
Derivative contracts | $ 0 |

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