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Income Taxes Income Taxes - Deferred Tax Balances (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Assets |  |  |  |  |
Deferred Tax Assets, Tax Loss And Tax Credit Carryforwards | [1] | $ 761 | $ 497 | $ 761 |
Deferred Tax Assets, Accrued Employee Benefits |  | 1,717 | 1,415 | 1,717 |
Deferred Tax Assets, Other Accruals and Reversals |  | 135 | 238 | 135 |
Deferred Tax Assets, Inventory |  | 25 | 127 | 25 |
Deferred Tax Assets, Investments |  | 53 | 56 | 53 |
Unrealized Exchange Gains / Losses |  | 0 | 2 | 0 |
Deferred Tax Liabilities, Other |  | 0 | 0 | 0 |
Deferred Tax Assets, Other |  | 148 | 91 | 148 |
Deferred Tax Assets, Gross |  | 2,970 | 2,612 | 2,970 |
Deferred Tax Assets, Valuation Allowance | [2] | (457) | (453) | (457) |
Deferred Tax Assets, Net of Valuation Allowance |  | 2,513 | 2,159 | 2,513 |
Liabilities |  |  |  |  |
Deferred Tax Liabilities, Property |  | 369 | 170 | 369 |
Deferred Tax Liabilities, Intangible Assets |  | 2,738 | 2,418 | 2,738 |
Deferred Tax Liabilities, Unrealized Exchange Gains/Losses |  | 39 | 0 | 39 |
Deferred Tax Liabilities, Gross |  | 3,146 | 2,588 | 3,146 |
Net Deferred Tax Liability |  | (633) | (429) | (633) |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  | 19 |  |
Deferred Tax Assets, Research and Development Capitalization |  | 131 | $ 186 | 131 |
Swiss VA [Member] |  |  |  |  |
Liabilities |  |  |  |  |
Other Tax (Benefit) Expense |  | $ (34) |  | $ (34) |
Brazil Valuation Allowance [Member] |  |  |  |  |
Liabilities |  |  |  |  |
Other Tax (Benefit) Expense |  |  |  |  | $ 75
[1] | Primarily related to the realization of recorded tax benefits on tax loss and credit carryforwards from operations in the United States, Brazil, and Spain.
[2] | During the year ended December 31, 2020, the company established a $19 million state tax valuation allowance in the U.S. based on a change in judgement about the realizability of a deferred tax asset. During the year ended December 31, 2019, the company released a valuation allowance against the net deferred tax asset position of a legal entity in Switzerland in connection with an internal merger, resulting in a tax benefit of $(34) million. During the year ended December 31, 2018, the company established a full valuation allowance against the net deferred tax asset position of a legal entity in Brazil due to revised financial projections, resulting in tax expense of $75 million. See Note 15 - Goodwill and Other Intangible Assets, to the Consolidated Financial Statements, for additional information. However, it is reasonably possible that sufficient positive evidence required to release all, or a portion, of certain valuation allowance in certain jurisdictions will exist within the next 12 months.

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