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Fair Value (Tables) | 6 Months Ended
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Jun. 30, 2016
Fair Value Disclosures [Abstract] |
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; (ii) interest rate swap agreements; and (iii) cross-currency swap agreements, based on the three levels established by the Codification (in millions). The tables also identify the impact of derivative contracts which we have elected to present on our accompanying consolidated balance sheets on a gross basis that are eligible for netting under master netting agreements.
| Balance sheet asset fair value measurements by level |  |  |  | Net amount
| Level 1 |  | Level 2 |  | Level 3 |  | Gross amount |  | Contracts available for netting |  | Cash collateral held(b)
As of June 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivative contracts(a) | $ | 6 |  |  | $ | 317 |  |  | $ | — |  |  | $ | 323 |  |  | $ | (32 | ) |  | $ | — |  |  | $ | 291 |
Interest rate swap agreements | $ | — |  |  | $ | 836 |  |  | $ | — |  |  | $ | 836 |  |  | $ | — |  |  | $ | — |  |  | $ | 836 |
Cross-currency swap agreements | $ | — |  |  | $ | 13 |  |  | $ | — |  |  | $ | 13 |  |  | $ | (13 | ) |  | $ | — |  |  | $ | — |
As of December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivative contracts(a) | $ | 48 |  |  | $ | 589 |  |  | $ | 2 |  |  | $ | 639 |  |  | $ | (12 | ) |  | $ | (37 | ) |  | $ | 590 |
Interest rate swap agreements | $ | — |  |  | $ | 385 |  |  | $ | — |  |  | $ | 385 |  |  | $ | (8 | ) |  | $ | — |  |  | $ | 377 |
Cross-currency swap agreements | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
| Balance sheet liability fair value measurements by level |  |  |  | Net amount
| Level 1 |  | Level 2 |  | Level 3 |  | Gross amount |  | Contracts available for netting |  | Collateral posted(c)
As of June 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivative contracts(a) | $ | (19 | ) |  | $ | (47 | ) |  | $ | — |  |  | $ | (66 | ) |  | $ | 32 |  |  | $ | 18 |  |  | $ | (16 | )
Interest rate swap agreements | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Cross-currency swap agreements | $ | — |  |  | $ | (34 | ) |  | $ | — |  |  | $ | (34 | ) |  | $ | 13 |  |  | $ | — |  |  | $ | (21 | )
As of December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivative contracts(a) | $ | (4 | ) |  | $ | (10 | ) |  | $ | (17 | ) |  | $ | (31 | ) |  | $ | 12 |  |  | $ | — |  |  | $ | (19 | )
Interest rate swap agreements | $ | — |  |  | $ | (25 | ) |  | $ | — |  |  | $ | (25 | ) |  | $ | 8 |  |  | $ | — |  |  | $ | (17 | )
Cross-currency swap agreements | $ | — |  |  | $ | (52 | ) |  | $ | — |  |  | $ | (52 | ) |  | $ | — |  |  | $ | — |  |  | $ | (52 | )
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(a) | Level 1 consists primarily of New York Mercantile Exchange natural gas futures. Level 2 consists primarily of OTC West Texas Intermediate swaps and options. Level 3 consists primarily of power derivative contracts.
(b) | Cash margin deposits held by us associated with our energy commodity contract positions and OTC swap agreements and reported within “Other current liabilities” on our accompanying consolidated balance sheets.
(c) | Cash margin deposits posted by us associated with our energy commodity contract positions and OTC swap agreements and reported within “Other current assets” on our accompanying consolidated balance sheets.
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 (in millions):
Significant unobservable inputs (Level 3)
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Derivatives-net asset (liability) |  |  |  |  |  |  |
Beginning of Period | $ | (2 | ) |  | $ | (49 | ) |  | $ | (15 | ) |  | $ | (61 | )
Total gains or (losses) included in earnings | (3 | ) |  | — |  |  | (9 | ) |  | — |
Settlements | 5 |  |  | 12 |  |  | 24 |  |  | 24 |
End of Period | $ | — |  |  | $ | (37 | ) |  | $ | — |  |  | $ | (37 | )
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 |  |  | $ | — |  |  | $ | 3 |
Schedule of Debt [Table Text Block] | The estimated fair value of our outstanding debt balances is disclosed below (in millions):
| June 30, 2016 |  | December 31, 2015
| Carrying value |  | Estimated fair value |  | Carrying value |  | Estimated fair value
Total debt | $ | 43,620 |  |  | $ | 43,061 |  |  | $ | 43,227 |  |  | $ | 37,481 |
We used Level 2 input values to measure the estimated fair value of our outstanding debt balances as of both June 30, 2016 and December 31, 2015.

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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=66048111&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=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + 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=66048111&loc=d3e19190-110258 + Details
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