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Income Taxes - Valuation Allowances Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Tax Carryforward [Line Items]        
Carryforwards $ 386 $ 441    
Valuation allowance 243 222 $ 237 $ 76
Deferred tax assets, net operating losses 276      
Deferred tax assets, tax credit carryforwards 110      
Deferred tax assets, tax credit carryforwards, expiring within 5 years 9      
Deferred tax assets, tax credit carryforwards, expiring after 5 years 93      
Deferred tax assets, tax credit carryforwards, no expiration 8      
Accrued income taxes 609      
Undistributed earnings of foreign subsidiaries 32,000      
Unrecognized tax benefits 452 $ 472 $ 319 $ 54
United States        
Other Tax Carryforward [Line Items]        
Deferred tax assets, net operating losses, expiring within 5 years 34      
Deferred tax assets, net operating losses, expiring after 5 years 110      
Brazil        
Other Tax Carryforward [Line Items]        
Deferred tax assets, net operating losses, no expiration $ 132