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Income Taxes - Reconciliation of Total Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of the Company's total gross unrecognized tax benefits |  |  |
Balance at beginning of the period | $ 99 | $ 87 | $ 79
Additions and reductions for tax positions of prior years |  | 16 |
Additions and reductions for tax positions of prior years | (20) |  | (4)
Additions based on tax positions related to the current year | 11 | 12 | 15
Reductions due to settlements |  | (16) |
Foreign currency translation |  |  | (3)
Foreign currency translation | 3 |  |
Balance at ending of the period | 93 | 99 | 87
Unrecognized tax benefits, which if recognized, would impact the Company's effective income tax rate | 80 | 86 | 78
Accrued interest and penalties | 14 | 11 | 10
Interest and penalties included in tax expense | $ 3 | $ 1 | $ 2

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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=120406818&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=84230637&loc=SL6600010-109319 + Details
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