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Income Taxes Income Tax Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |
Tax benefit related to the impact of recent tax law enactment in foreign jurisdictions |  | $ 14 |  | $ 14
Tax benefit related to an elective change in accounting method for the impact of the Act's foreign tax provisions |  | $ 51 |  | $ 51
Net tax benefits associated with changes in accruals | $ 18 |  | $ 25 |

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- Definition Net tax benefits associated with changes in accruals for certain prior year tax positions in various jurisdictions + References No definition available. + Details
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- Definition Tax benefit related to return to accrual adjustment associated with elective change in accounting method for 2019 tax year impact of The Act's foreign tax provisions. + References No definition available. + Details
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- Definition Tax benefit related to accrual adjustment to reflect change in estimate on impact of tax law enactment in a foreign jurisdiction. + References No definition available. + Details
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- References No definition available. + Details
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