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Income Taxes (Details 4) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2021
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Unrecognized Tax Benefits | $ 175 | $ 188 | $ 113 |
Income Tax Examination, Penalties and Interest Accrued | 1 | 26 |  |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount |  |  | 20 |
Income Tax Examination, Penalties and Interest Expense | 2 | 13 | $ 2 |
Deferred Tax Assets, Tax Deferred Expense | $ 847 | 718 |  |
UNITED KINGDOM |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Deferred Tax Assets, Tax Deferred Expense |  | $ 220 |  |
Tax Benefit Amortization Period | 20 years |  |  |
Forecast [Member] |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Unrecognized Tax Benefits |  |  |  | $ 30

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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