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Derivative and Hedging Activities - Fair Value Level 3 Measurements (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance, beginning of period | $ 282 |
Balance, end of period | 130 | $ 282
Energy related derivative |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance, beginning of period | 282 |
Balance, end of period | 130 | 282
Energy related derivative | Future natural gas prices | Utica shale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance, beginning of period | 7 |
Balance, end of period | 0 | 7
Fair value, inputs, level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance, beginning of period | 94 |
Balance, end of period | 12 | 94
Fair value, inputs, level 3 | Commodity contracts |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance, beginning of period | 87 | (15)
Total gains (losses) (realized/unrealized): Included in earnings | (59) | 77
Total purchases, issuances, sales and settlements: Settlements | (16) | 25
Balance, end of period | 12 | 87
Fair value, inputs, level 3 | Energy related derivative | Future natural gas prices | Utica shale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance, beginning of period | 7 | 0
Total gains (losses) (realized/unrealized): Included in earnings | (7) | 7
Total purchases, issuances, sales and settlements: Settlements | 0 | 0
Balance, end of period | 0 | 7
Oil, natural gas and NGL sales | Fair value, inputs, level 3 | Commodity contracts |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Total gains (losses) (realized/unrealized): Included in earnings | (59) | 77
Change in unrealized gains (losses) related to assets still held at reporting date | (19) | 86
Oil, natural gas and NGL sales | Fair value, inputs, level 3 | Energy related derivative | Future natural gas prices | Utica shale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Total gains (losses) (realized/unrealized): Included in earnings | (7) | 7
Change in unrealized gains (losses) related to assets still held at reporting date | $ 0 | $ 7

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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