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Income Taxes Uncertain tax positions (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Unrecognized Tax Benefits | $ 9 | $ 11 | $ 38 | $ 41
Tax positions taken in current year | 1 | 1 | 1 |
Tax positions taken in prior years | 0 | 1 | 0 |
Settlements during the year | 0 | 0 | (4) |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 3 | 29 | $ 0 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 0 | 0 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Paid | 0 | $ 0 |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 9 |  |  |

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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=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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