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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Income Tax Contingency [Line Items] |  |
Estimated annual effective tax rate | 25.20% | 25.20%
Effective tax rate | 19.10% | 21.20%
Discrete net tax benefits | $ 65 | $ 28
Net benefit from the release of uncertain tax positions due to expiration of statutes of limitations, audit settlements | 32 | $ 22
U.S. |  |
Income Tax Contingency [Line Items] |  |
Tax benefit due to new tax guidance | $ 27 |

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