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Income Taxes - Possible Changes of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Reasonably possible change in unrecognized tax benefits |  |
Foreign tax credit carryovers | $ 130 | $ 117
Unused foreign tax credits expiring in 2021 through 2030 | 85 |
Unused foreign tax credits carried over indefinitely | 45 |
Operating and capital loss carryforwards with indefinite life | 158 |
Operating and capital loss carryforwards expire between 2021 and 2040 | 118 |
Unused research tax credits expiring from 2021 to 2039 | $ 18 |
Period during which unrecognized tax benefits are reasonably possible of being settled as a result of audit settlements or statute expirations | 12 months |
Maximum |  |
Reasonably possible change in unrecognized tax benefits |  |
Reasonably possible decrease in unrecognized tax benefits related to audit settlements or statute expirations | $ 19 |

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- Definition The tax effect as of the balance sheet date of the amount of future tax deductions arising from operating losses and capital losses which expire in a definite amount of time. + References No definition available. + Details
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- Definition The tax effect as of the balance sheet date of the amount of future tax deductions arising from operating losses and capital losses which can be carried forward indefinitely. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards carried over indefinitely. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards expiring In 2021 through 2030. + References No definition available. + Details
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- Definition This element represents the period for which the entity does not anticipate any change in the total amount of unrecognized income tax benefits. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + 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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