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Income Taxes - Effective Income Tax Expense (Benefit) Table (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 21.00% | 21.00% | 35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Income tax expense (benefit) at the federal statutory rate (21%, 21%, 35%) | $ (134) | $ 45 | $ (175)
State income taxes (net of federal income tax benefit) | (21) | 27 | 5
Partial release of valuation allowance due to the WildHorse Merger | (314) | 0 | 0
Remeasurement of deferred tax assets and liabilities | 0 | 0 | 931
Change in valuation allowance excluding impact of WildHorse Merger | 114 | (97) | (771)
Other | 24 | 15 | 12
Total Income Tax Expense (Benefit) | $ (331) | $ (10) | $ 2

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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