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Income Taxes (Textuals) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Jun. 30, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Income tax provision | $ 4 | $ 15 |  |
Effective tax rate | 10.00% | 16.60% |  |
Unrecognized tax benefits | $ 128 |  |  | $ 129
Interest accrued for unrecognized tax benefits | $ 9 |  |  |
Assessment for tax, penalties and interest |  |  |  | $ 80
Scenario, Forecast |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Reduction from statute of limitations |  |  | $ 4 |

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- Definition Estimated amount of loss resulting from an adverse tax position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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