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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.