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Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2018
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 |  |  |  |
| Level 1 |  | Level 2 |  | Level 3 |  | Gross amount |  | Contracts available for netting |  | Cash collateral held(b) |  | Net amount
As of December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivative contracts(a) | $ | 28 |  |  | $ | 193 |  |  | $ | — |  |  | $ | 221 |  |  | $ | (39 | ) |  | $ | (25 | ) |  | $ | 157 |
Interest rate contracts | $ | — |  |  | $ | 133 |  |  | $ | — |  |  | $ | 133 |  |  | $ | (7 | ) |  | $ | — |  |  | $ | 126 |
Foreign currency contracts | $ | — |  |  | $ | 197 |  |  | $ | — |  |  | $ | 197 |  |  | $ | (6 | ) |  | $ | — |  |  | $ | 191 |
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivative contracts(a) | $ | 17 |  |  | $ | 70 |  |  | $ | — |  |  | $ | 87 |  |  | $ | (42 | ) |  | $ | (12 | ) |  | $ | 33 |
Interest rate contracts | $ | — |  |  | $ | 205 |  |  | $ | — |  |  | $ | 205 |  |  | $ | (15 | ) |  | $ | — |  |  | $ | 190 |
Foreign currency contracts | $ | — |  |  | $ | 166 |  |  | $ | — |  |  | $ | 166 |  |  | $ | (6 | ) |  | $ | — |  |  | $ | 160 |
| Balance sheet liability fair value measurements by level |  |  |  |
| Level 1 |  | Level 2 |  | Level 3 |  | Gross amount |  | Contracts available for netting |  | Collateral posted(b) |  | Net amount
As of December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivative contracts(a) | $ | (11 | ) |  | $ | (39 | ) |  | $ | — |  |  | $ | (50 | ) |  | $ | 39 |  |  | $ | — |  |  | $ | (11 | )
Interest rate contracts | $ | — |  |  | $ | (115 | ) |  | $ | — |  |  | $ | (115 | ) |  | $ | 7 |  |  | $ | — |  |  | $ | (108 | )
Foreign currency contracts | $ | — |  |  | $ | (6 | ) |  | $ | — |  |  | $ | (6 | ) |  | $ | 6 |  |  | $ | — |  |  | $ | — |
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivative contracts(a) | $ | (3 | ) |  | $ | (98 | ) |  | $ | — |  |  | $ | (101 | ) |  | $ | 42 |  |  | $ | — |  |  | $ | (59 | )
Interest rate contracts | $ | — |  |  | $ | (65 | ) |  | $ | — |  |  | $ | (65 | ) |  | $ | 15 |  |  | $ | — |  |  | $ | (50 | )
Foreign currency contracts | $ | — |  |  | $ | (6 | ) |  | $ | — |  |  | $ | (6 | ) |  | $ | 6 |  |  | $ | — |  |  | $ | — |
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(a) | Level 1 consists primarily of NYMEX natural gas futures. Level 2 consists primarily of OTC WTI swaps and NGL swaps.
(b) | Any cash collateral paid or received is reflected in this table, but only to the extent that it represents variation margins. Any amount associated with derivative prepayments or initial margins that are not influenced by the derivative asset or liability amounts or those that are determined solely on their volumetric notional amounts are excluded from this table.
Fair Value, by Balance Sheet Grouping | The carrying value and estimated fair value of our outstanding debt balances is disclosed below (in millions):
| December 31, 2018 |  | December 31, 2017
| Carrying value |  | Estimated fair value |  | Carrying value |  | Estimated fair value
Total debt | $ | 37,324 |  |  | $ | 37,469 |  |  | $ | 37,843 |  |  | $ | 40,050 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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