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Fair Value Measurements and Credit Concentration (Assets and Liabilities Measured on Recurring Basis Table) (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Price risk management assets: |  |  |
Gross |  | $ 840 | $ 693
Price risk management liabilities: |  |  |
Gross |  | 619 | 539
Recurring |  |  |
Assets |  |  |
Cash and cash equivalents |  | 393 | 141
Restricted cash and cash equivalents | [1] | 72 | 106
Price risk management assets: |  |  |
Gross |  | 840 | 693
NDT funds |  | 964 | 951
Total assets |  | 2,275 | 1,897
Price risk management liabilities: |  |  |
Gross |  | 619 | 539
Recurring | Cash and cash equivalents |  |  |
Price risk management assets: |  |  |
NDT funds |  | 7 | 11
Recurring | U.S. large-cap |  |  |
Price risk management assets: |  |  |
NDT funds |  | 623 | 616
Recurring | U.S. mid/small-cap |  |  |
Price risk management assets: |  |  |
NDT funds |  | 87 | 87
Recurring | U.S. Treasury |  |  |
Price risk management assets: |  |  |
NDT funds |  | 106 | 98
Recurring | U.S. government sponsored agency |  |  |
Price risk management assets: |  |  |
NDT funds |  | 5 | 6
Recurring | Municipality |  |  |
Price risk management assets: |  |  |
NDT funds |  | 87 | 83
Recurring | Investment-grade corporate |  |  |
Price risk management assets: |  |  |
NDT funds |  | 44 | 47
Recurring | Other |  |  |
Price risk management assets: |  |  |
NDT funds |  | 3 | 3
Recurring | Receivables/payables, net |  |  |
Price risk management assets: |  |  |
NDT funds |  | 2 | 0
Recurring | Auction Rate Securities |  |  |
Price risk management assets: |  |  |
Auction rate securities | [2] | 6 | 6
Recurring | Level 1 |  |  |
Assets |  |  |
Cash and cash equivalents |  | 393 | 141
Restricted cash and cash equivalents | [1] | 72 | 106
Price risk management assets: |  |  |
Gross |  | 0 | 0
NDT funds |  | 611 | 601
Total assets |  | 1,076 | 848
Price risk management liabilities: |  |  |
Gross |  | 0 | 0
Recurring | Level 1 | Cash and cash equivalents |  |  |
Price risk management assets: |  |  |
NDT funds |  | 7 | 11
Recurring | Level 1 | U.S. large-cap |  |  |
Price risk management assets: |  |  |
NDT funds |  | 462 | 457
Recurring | Level 1 | U.S. mid/small-cap |  |  |
Price risk management assets: |  |  |
NDT funds |  | 37 | 37
Recurring | Level 1 | U.S. Treasury |  |  |
Price risk management assets: |  |  |
NDT funds |  | 106 | 98
Recurring | Level 1 | Receivables/payables, net |  |  |
Price risk management assets: |  |  |
NDT funds |  | (1) | (2)
Recurring | Level 2 |  |  |
Price risk management assets: |  |  |
Gross |  | 751 | 597
NDT funds |  | 353 | 350
Total assets |  | 1,104 | 947
Price risk management liabilities: |  |  |
Gross |  | 598 | 497
Recurring | Level 2 | U.S. large-cap |  |  |
Price risk management assets: |  |  |
NDT funds |  | 161 | 159
Recurring | Level 2 | U.S. mid/small-cap |  |  |
Price risk management assets: |  |  |
NDT funds |  | 50 | 50
Recurring | Level 2 | U.S. government sponsored agency |  |  |
Price risk management assets: |  |  |
NDT funds |  | 5 | 6
Recurring | Level 2 | Municipality |  |  |
Price risk management assets: |  |  |
NDT funds |  | 87 | 83
Recurring | Level 2 | Investment-grade corporate |  |  |
Price risk management assets: |  |  |
NDT funds |  | 44 | 47
Recurring | Level 2 | Other |  |  |
Price risk management assets: |  |  |
NDT funds |  | 3 | 3
Recurring | Level 2 | Receivables/payables, net |  |  |
Price risk management assets: |  |  |
NDT funds |  | 3 | 2
Recurring | Level 3 |  |  |
Price risk management assets: |  |  |
Gross |  | 89 | 96
Total assets |  | 95 | 102
Price risk management liabilities: |  |  |
Gross |  | 21 | 42
Recurring | Level 3 | Auction Rate Securities |  |  |
Price risk management assets: |  |  |
Auction rate securities | [2] | 6 | 6
Energy Commodities, net | Recurring |  |  |
Price risk management assets: |  |  |
Gross |  | 840 | 693
Price risk management liabilities: |  |  |
Gross |  | 619 | 539
Energy Commodities, net | Recurring | Level 1 |  |  |
Price risk management assets: |  |  |
Gross |  | 0 | 0
Price risk management liabilities: |  |  |
Gross |  | 0 | 0
Energy Commodities, net | Recurring | Level 2 |  |  |
Price risk management assets: |  |  |
Gross |  | 751 | 597
Price risk management liabilities: |  |  |
Gross |  | 598 | 497
Energy Commodities, net | Recurring | Level 3 |  |  |
Price risk management assets: |  |  |
Gross |  | 89 | 96
Price risk management liabilities: |  |  |
Gross |  | $ 21 | $ 42
[1] | Current portion is included in "Restricted cash and cash equivalents" and long-term portion is included in "Other noncurrent assets" on the Balance Sheets.
[2] | Included in "Other investments" on the Balance Sheets.

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- Definition The combined current and noncurrent carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. + References No definition available. + Details
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