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Income Taxes Income Taxes - Reconciliation to US Statutory Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Brazil Valuation Allowance [Member] |  |  |  |  |
Other Tax (Benefit) Expense |  |  |  |  | $ 75
Change in accounting method [Member] |  |  |  |  |
Other Tax (Benefit) Expense |  | $ (29) |  |  |
Continuing Operations [Member] |  |  |  |  |
Statutory U.S. federal income tax rate |  |  | 21.00% | 21.00% | 21.00%
Effective tax rates on international operations - net | [1] |  | (13.90%) | (18.40%) | 0.40%
Acquisitions, divestitures, and ownership restructuring activities | [2],[3],[4] |  | (0.30%) | (10.70%) | (2.30%)
U.S. research and development credit |  |  | (2.90%) | 7.00% | 0.10%
Exchange gains/losses | [5] |  | 3.50% | (1.80%) | (1.30%)
SAB 118 Impact of Enactment of U.S. Tax Reform | [6] |  | 0.00% | 0.00% | (3.00%)
State and Local Income Taxes |  |  | 4.00% | 3.20% | 0.50%
Impact of Swiss Tax Reform | [7] |  | (27.00%) | 11.90% | 0.00%
Excess tax benefits (tax deficiency) from stock-compensation |  |  | 1.00% | (0.60%) | 0.10%
Tax settlements and expiration of statue of limitations |  |  | 0.40% | 3.90% | (0.10%)
Goodwill impairment | [8] |  | 0.00% | 0.00% | (15.20%)
Other, net |  |  | 2.20% | (0.90%) | 0.30%
Effective Income Tax Rate |  |  | (12.00%) | 14.60% | 0.50%
Tax benefit related to an internal legal entity restructuring associated with the Business Separations |  |  |  |  | $ 25
Continuing Operations [Member] | Repatriation Accrual [Member] |  |  |  |  |
Other Tax (Benefit) Expense |  |  |  |  | 50
Continuing Operations [Member] | Tax benefit (charge) related to The Act [Member] |  |  |  |  |
Other Tax (Benefit) Expense |  |  |  |  | 164
Continuing Operations [Member] | Swiss Tax Reform [Member] |  |  |  |  |
Other Tax (Benefit) Expense |  |  | $ (182) | $ (38) |
Continuing Operations [Member] | Brazil Valuation Allowance [Member] |  |  |  |  |
Other Tax (Benefit) Expense |  |  |  |  | $ 75
Continuing Operations [Member] | Change in accounting method [Member] |  |  |  |  |
Other Tax (Benefit) Expense |  |  | $ (51) |  |
[1] | Includes the effects of local and U.S. taxes related to earnings of non-U.S. subsidiaries, changes in the amount of unrecognized tax benefits associated with these earnings, losses at non-U.S. subsidiaries without local tax benefits due to valuation allowances, and other permanent differences between tax and U.S. GAAP results. Includes a tax benefit of $(51) million for the year ended December 31, 2020, related to a return to accrual adjustment associated with an elective change in accounting method for the 2019 tax year impact of The Act's foreign tax provisions.
[2] | Includes a net tax charge of $25 million for the year ended December 31, 2018 related to an internal legal entity restructuring associated with the Business Separations.
[3] | Includes a net tax charge of $50 million related to repatriation activities to facilitate the Business Separations for the year ended December 31, 2018.
[4] | See Notes 4 - Common Control Business Combination, and Note 5 - Divestitures and Other Transactions, to the Consolidated Financial Statements, for additional information.
[5] | Principally reflects the impact of foreign exchange gains and losses on net monetary assets for which no corresponding tax impact is realized. Further information about the company's foreign currency hedging program is included in Note 9 - Supplementary Information, and Note 22 - Financial Instruments, under the heading Foreign Currency Risk.
[6] | Reflects a net tax charge of $164 million associated with the company's completion of the accounting for the tax effects of The Act for the year ended December 31, 2018.
[7] | Reflects tax benefits of $(182) million primarily driven by the recognition of an elective cantonal component of the recent enactment of the Federal Act on Tax Reform and AHV Financing ("Swiss Tax Reform") for the year ended December 31, 2020. Reflects tax benefits of $(38) million associated with the enactment of the Federal Act on Tax Reform and AHV Financing ("Swiss Tax Reform"), for the year ended December 31, 2019.
[8] | Reflects the impact of the non-tax-deductible, non-cash impairment charge for the agriculture reporting unit and corresponding $75 million tax charge associated with a valuation allowance recorded against the net deferred tax asset position of a legal entity in Brazil for the year ended December 31, 2018.

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