v2.4.0.6

Fair Value (Tables) | 3 Months Ended
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Mar. 31, 2013
Summary of debt carry value [Line Items] |
Summary of debt carry value [Table Text Block] | The estimated fair value of our outstanding debt balance as of March 31, 2013 and December 31, 2012 (both short-term and long-term and including debt fair value adjustments), is disclosed below (in millions):
| March 31, 2013 |  | December 31, 2012
| Carrying Value |  | Estimated Fair Value |  | Carrying Value |  | Estimated Fair Value
Total debt | $ | 34,390 |  |  | $ | 36,248 |  |  | $ | 34,401 |  |  | $ | 36,720 |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following two tables summarize the fair value measurements of our (i) energy commodity derivative contracts and (ii) interest rate swap agreements as of March 31, 2013 and December 31, 2012, based on the three levels established by the Codification. The fair values of our current and non-current asset and liability derivative contracts are each reported separately as “Fair value of derivative contracts” in the respective sections of our accompanying consolidated balance sheets. The fair value measurements in the tables below do not include cash margin deposits made by us or our counterparties, which are reported within “Other current assets” and “Accrued other current liabilities,” respectively, in our accompanying consolidated balance sheets (in millions).
| Asset fair value measurements using
| Total |  | Quoted prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3)
As of March 31, 2013 |  |  |  |  |  |  |
Energy commodity derivative contracts(a) | $ | 78 |  |  | $ | 2 |  |  | $ | 57 |  |  | $ | 19 |
Interest rate swap agreements | $ | 579 |  |  | $ | — |  |  | $ | 579 |  |  | $ | — |
As of December 31, 2012 |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivative contracts(a) | $ | 107 |  |  | $ | 3 |  |  | $ | 76 |  |  | $ | 28 |
Interest rate swap agreements | $ | 665 |  |  | $ | — |  |  | $ | 665 |  |  | $ | — |
| Liability fair value measurements using
| Total |  | Quoted prices in active markets for identical liabilities (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3)
As of March 31, 2013 |  |  |  |  |  |  |
Energy commodity derivative contracts(a) | $ | (217 | ) |  | $ | (17 | ) |  | $ | (39 | ) |  | $ | (161 | )
Interest rate swap agreements | $ | (3 | ) |  | $ | — |  |  | $ | (3 | ) |  | $ | — |
As of December 31, 2012 |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivative contracts(a) | $ | (212 | ) |  | $ | (3 | ) |  | $ | (26 | ) |  | $ | (183 | )
Interest rate swap agreements | $ | (1 | ) |  | $ | — |  |  | $ | (1 | ) |  | $ | — |
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(a) | Level 1 consists primarily of the New York Mercantile Exchange (NYMEX) natural gas futures. Level 2 consists primarily of over-the-counter (OTC) West Texas Intermediate swaps and OTC natural gas swaps that are settled on NYMEX. Level 3 consists primarily of West Texas Intermediate options, West Texas Intermediate basis swaps and power derivative contracts.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | The table below provides a summary of changes in the fair value of our Level 3 energy commodity derivative contracts for each of the three months ended March 31, 2013 and 2012 (in millions): Significant unobservable inputs (Level 3)
| Three Months Ended March 31,
| 2013 |  | 2012
Derivatives-net asset (liability) |  |  |
Beginning of Period | $ | (155 | ) |  | $ | 7 |
Total gains or (losses) |  |  |  |  |
Included in earnings | 5 |  |  | 2 |
Included in other comprehensive loss | (1 | ) |  | (22 | )
Purchases | — |  |  | 3 |
Settlements | 9 |  |  | 7 |
End of Period | $ | (142 | ) |  | $ | (3 | )
The amount of total gains or (losses) for the period included in earnings attributable to the change in unrealized gains or (losses) relating to assets held at the reporting date | $ | (1 | ) |  | $ | 2 |

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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 (loss), 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, issues, 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 Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 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=7578670&loc=d3e19279-110258 Reference 3: 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. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 + Details
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