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Income Taxes Accounting for Uncertainty in Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Unrecognized Tax Benefits | $ (19) | $ (19) | $ (20) | $ (20)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  |  |  | 17
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit |  |  |  | $ 1
Increase (Decrease) in Interest Accrued for Unrecognized Tax Benefits | 1 | 2 |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns |  |  |  |
Unrecognized Tax Benefits, Beginning of Period | 19 | 20 | 75 |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  |  | (54) |
Reduction due to lapse of statute of limitations |  | (1) | (1) |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 1 |  |  |
Unrecognized Tax Benefits, End of Period | $ 20 | $ 19 | $ 20 |

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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 The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + 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) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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