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Derivative and Hedging Activities - Fair Value of Recurring Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Derivative assets (liabilities), at fair value, net | $ 262 | $ 282 |  |
Commodity contract |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Derivative asset | 314 | 422 |  |
Derivative liability | 52 | 147 |  |
Energy related derivative |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Derivative assets (liabilities), at fair value, net | 262 | 282 |  |
Energy related derivative | Future Natural Gas Prices | Utica Shale |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Derivative asset | 0 | 7 |  |
Derivative assets (liabilities), at fair value, net | 0 | 7 |  |
Quoted Prices in Active Markets (Level 1) |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Derivative assets (liabilities), at fair value, net | 0 | 0 |  |
Quoted Prices in Active Markets (Level 1) | Commodity contract |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Derivative asset | 0 | 0 |  |
Derivative liability | 0 | 0 |  |
Quoted Prices in Active Markets (Level 1) | Energy related derivative | Future Natural Gas Prices | Utica Shale |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Derivative asset | 0 | 0 |  |
Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Derivative assets (liabilities), at fair value, net | 240 | 188 |  |
Significant Other Observable Inputs (Level 2) | Commodity contract |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Derivative asset | 280 | 319 |  |
Derivative liability | 40 | 131 |  |
Significant Other Observable Inputs (Level 2) | Energy related derivative | Future Natural Gas Prices | Utica Shale |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Derivative asset | 0 | 0 |  |
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Derivative assets (liabilities), at fair value, net | 22 | 94 |  |
Significant Unobservable Inputs (Level 3) | Commodity contract |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Derivative asset | 34 | 103 |  |
Derivative liability | 12 | 16 |  |
Derivative assets (liabilities), at fair value, net | 22 | 87 | $ (45) | $ (15)
Significant Unobservable Inputs (Level 3) | Energy related derivative | Future Natural Gas Prices | Utica Shale |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Derivative asset | 0 | 7 |  |
Derivative assets (liabilities), at fair value, net | $ 0 | $ 7 | $ 0 | $ 0

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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