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Income Taxes (Net Operating Loss Carryforwards) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Federal |  |
Operating Loss Carryforwards | $ 402 | $ 521
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2032 |
State |  |
Operating Loss Carryforwards | $ 1,197 | $ 1,577
Operating Loss Carryforwards Earliest Expiration Date | 2020 |
Operating Loss Carryforwards Latest Expiration Date | 2039 |

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- Definition Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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