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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in valuation allowance | $ 3 | $ (17) | $ (9)
Foreign Tax Authority [Member] |  |  |
Tax Credit Carryforward, Amount | 3 |  |
Operating Loss Carryforwards | 209 |  |
State and Local Jurisdiction [Member] |  |  |
Tax Credit Carryforward, Amount | 22 |  |
Operating Loss Carryforwards | $ 807 |  |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + 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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