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Fair Value of FInancial Instruments Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2011
Fair Value of Financial Instruments [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | The Company’s financial assets and liabilities whose values were recognized at fair value are as follows by level within the fair value hierarchy (in millions):
| As of December 31, 2011
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Nuclear decommissioning trust (1): |  |  |  |  |  |  |
Money market funds | $ | — |  |  | $ | 14 |  |  | $ | — |  |  | $ | 14 |
Debt securities: |  |  |  |  |  |  |
Domestic government | 3 |  |  | 9 |  |  | — |  |  | 12 |
Corporate credit | — |  |  | 11 |  |  | — |  |  | 11 |
Non-qualified benefit plan trust (2): |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |
Domestic | 7 |  |  | 2 |  |  | — |  |  | 9 |
International | 1 |  |  | — |  |  | — |  |  | 1 |
Debt securities - domestic government | 3 |  |  | — |  |  | — |  |  | 3 |
Assets from price risk management activities (1) (3): |  |  |  |  |  |  |
Electricity | — |  |  | 2 |  |  | — |  |  | 2 |
Natural gas | — |  |  | 17 |  |  | — |  |  | 17 |
| $ | 14 |  |  | $ | 55 |  |  | $ | — |  |  | $ | 69 |
Liabilities - Liabilities from price risk management activities (1) (3): |  |  |  |  |  |  |
Electricity | $ | — |  |  | $ | 108 |  |  | $ | 29 |  |  | $ | 137 |
Natural gas | — |  |  | 201 |  |  | 50 |  |  | 251 |
| $ | — |  |  | $ | 309 |  |  | $ | 79 |  |  | $ | 388 |
(1) | Activities are subject to regulation, with certain gains and losses deferred pursuant to regulatory accounting and included in regulatory assets or regulatory liabilities as appropriate.
(2) | Excludes insurance policies of $23 million, which are recorded at cash surrender value.
(3) | For further information, see Note 5, Price Risk Management.
| As of December 31, 2010
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Nuclear decommissioning trust (1): |  |  |  |  |  |  |
Money market funds | $ | — |  |  | $ | 13 |  |  | $ | — |  |  | $ | 13 |
Debt securities: |  |  |  |  |  |  |
Domestic government | 3 |  |  | 9 |  |  | — |  |  | 12 |
Corporate credit | — |  |  | 9 |  |  | — |  |  | 9 |
Non-qualified benefit plan trust (2): |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |
Domestic | 16 |  |  | — |  |  | — |  |  | 16 |
International | 2 |  |  | 1 |  |  | — |  |  | 3 |
Debt securities - domestic government | 2 |  |  | — |  |  | — |  |  | 2 |
Assets from price risk management activities (1) (3): |  |  |  |  |  |  |
Electricity | — |  |  | 4 |  |  | 1 |  |  | 5 |
Natural gas | — |  |  | 11 |  |  | — |  |  | 11 |
| $ | 23 |  |  | $ | 47 |  |  | $ | 1 |  |  | $ | 71 |
Liabilities - Liabilities from price risk management activities (1) (3): |  |  |  |  |  |  |
Electricity | $ | — |  |  | $ | 102 |  |  | $ | 17 |  |  | $ | 119 |
Natural gas | — |  |  | 153 |  |  | 104 |  |  | 257 |
| $ | — |  |  | $ | 255 |  |  | $ | 121 |  |  | $ | 376 |
(1) | Activities are subject to regulation, with certain gains and losses deferred pursuant to regulatory accounting and included in regulatory assets or regulatory liabilities as appropriate.
(2) | Excludes insurance policies of $23 million, which are recorded at cash surrender value.
(3) | For further information, see Note 5, Price Risk Management.
The fair values of the Company’s pension plan assets and other postretirement benefit plan assets by asset category are as follows (in millions):
| As of December 31, 2011
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Defined Benefit Pension Plan assets: |  |  |  |  |  |  |
Money market funds | $ | — |  |  | $ | 3 |  |  | $ | — |  |  | $ | 3 |
Equity securities: |  |  |  |  |  |  |
Domestic | 151 |  |  | 12 |  |  | — |  |  | 163 |
International | 54 |  |  | 51 |  |  | — |  |  | 105 |
Debt securities: |  |  |  |  |  |  |
Domestic government and corporate credit | — |  |  | 78 |  |  | — |  |  | 78 |
Corporate credit | 76 |  |  | — |  |  | — |  |  | 76 |
Private equity funds | — |  |  | — |  |  | 32 |  |  | 32 |
Alternative investments | — |  |  | — |  |  | 30 |  |  | 30 |
| $ | 281 |  |  | $ | 144 |  |  | $ | 62 |  |  | $ | 487 |
Other Postretirement Benefit Plans assets: |  |  |  |  |  |  |
Money market funds | $ | — |  |  | $ | 7 |  |  | $ | — |  |  | $ | 7 |
Equity securities: |  |  |  |  |  |  |
Domestic | 12 |  |  | 1 |  |  | — |  |  | 13 |
International | 2 |  |  | 2 |  |  | — |  |  | 4 |
Debt securities—Domestic government | 3 |  |  | — |  |  | — |  |  | 3 |
| $ | 17 |  |  | $ | 10 |  |  | $ | — |  |  | $ | 27 |
| As of December 31, 2010
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Defined Benefit Pension Plan assets: |  |  |  |  |  |  |
Money market funds | $ | — |  |  | $ | 15 |  |  | $ | — |  |  | $ | 15 |
Equity securities: |  |  |  |  |  |  |
Domestic | 52 |  |  | 111 |  |  | — |  |  | 163 |
International | 53 |  |  | 53 |  |  | — |  |  | 106 |
Debt securities—Domestic government and corporate credit | 68 |  |  | 70 |  |  | — |  |  | 138 |
Private equity funds | — |  |  | — |  |  | 23 |  |  | 23 |
Alternative investments | — |  |  | — |  |  | 28 |  |  | 28 |
| $ | 173 |  |  | $ | 249 |  |  | $ | 51 |  |  | $ | 473 |
Other Postretirement Benefit Plans assets: |  |  |  |  |  |  |
Money market funds | $ | — |  |  | $ | 7 |  |  | $ | — |  |  | $ | 7 |
Equity securities: |  |  |  |  |  |  |
Domestic | 3 |  |  | 2 |  |  | — |  |  | 5 |
International | 1 |  |  | 1 |  |  | — |  |  | 2 |
Debt securities—Domestic government | 2 |  |  | — |  |  | — |  |  | 2 |
| $ | 6 |  |  | $ | 10 |  |  | $ | — |  |  | $ | 16 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | Changes in the fair value of net liabilities from price risk management activities (net of assets from price risk management activities) classified as Level 3 in the fair value hierarchy were as follows for the year ended December 31, 2011 (in millions):
Net liabilities from price risk management activities as of December 31, 2010 | $ | 120 |
Net realized and unrealized losses (1) | 86 |
Purchases | 3 |
Settlements | (1 | )
Net transfers out of Level 3 to Level 2 | (129 | )
Net liabilities from price risk management activities as of December 31, 2011 | $ | 79 |
Level 3 net unrealized losses that have been fully offset by the effect of regulatory accounting | $ | 88 |
(1) | Contains nominal amounts of realized losses, net.
The comparable information contained in the preceding table was as follows for the years ended December 31 (in millions):
| 2010 |  | 2009
Net liabilities from price risk management activities as of beginning of year | $ | 154 |  |  | $ | 123 |
Net realized and unrealized losses (1) | 65 |  |  | 47 |
Purchases, issuances, and settlements, net | 27 |  |  | — |
Net transfers out of Level 3 to Level 2 | (126 | ) |  | (16 | )
Net liabilities from price risk management activities as of end of year | $ | 120 |  |  | $ | 154 |
Level 3 net unrealized losses that have been fully offset by the effect of regulatory accounting | $ | 95 |  |  | $ | 49 |
(1) | Contains nominal amounts of realized losses, net.

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19279-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 820 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258 + Details
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