Summary of Significant Accounting Principles (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
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| Accounting Policies [Abstract] | ||
| 2021 Finance Act, income tax adjustment | $ 2,000 | $ 700 |
| Tax law changes | $ 2,000 | $ 700 |
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- Definition U.K. Finance Act 2021, Change In Tax Rate, Deferred Tax Asset, Income Tax Adjustment No definition available.
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| X | ||||||||||
- References No definition available.
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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