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Commitments and Contingencies - Litigation-Related Liability and Tax Administrative Matters (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
numberOfLitigationCase
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Accrued Liabilities, Current and Other Liabilities, Noncurrent      
Loss Contingencies [Line Items]      
Estimated litigation liability   $ 1,100 $ 1,200
Indirect Tax Matters      
Loss Contingencies [Line Items]      
Estimate of possible loss   800  
Korea Wage Litigation - Salaried      
Loss Contingencies [Line Items]      
Estimate of possible loss   180  
Korea Wage Litigation - Former Subcontract Workers      
Loss Contingencies [Line Items]      
Estimate of possible loss   120  
Probable loss accrual   $ 250  
Foreign Tax Authority | Brazil      
Loss Contingencies [Line Items]      
Number of rendered favorable decisions | numberOfLitigationCase 3    
Estimated potential recovery from taxing authority $ 1,400