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Income Taxes - Unrecognized tax benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Taxes |  |
Balance at beginning of period | $ 46 | $ 22
Additions for tax positions related to prior years | 2 | 33
Reductions for tax positions related to prior years | (9) |
Additions based on tax positions related to the current year | 2 |
Reductions related to a lapse in the statute of limitations | (12) | (9)
Balance at end of period | 29 | $ 46
Unrecognized tax benefit that, if recognized, could affect the effective tax rate in future periods | 18 |
Remaining unrecognized tax benefits | 11 |
Unrecognized tax benefits, accrued interest expense and penalties | 3 |
Amount of unrecognized tax benefits that may be recognized within 12 | 0 |
Unrecognized tax benefits, current | $ 0 |

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- Definition The total amount of unrecognized tax benefits that, if recognized, could affect the effective tax rate in future periods. + References No definition available. + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would not affect the effective tax rate. + 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=121826272&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=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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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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