v3.20.4
Tax Matters - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 29, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Contingency [Line Items]        
Tax benefit related to measurement adjustment       $ 100
Repatriation tax liability   $ 15,000    
Tax benefit from IRS settlement     $ 1,400  
Deconsolidation gain $ 2,700      
Unremitted earnings of international subsidiaries   55,000    
Unrecognized tax benefits excluding associated interest   4,300 4,200  
Deferred tax assets associated with unrecognized tax benefits   1,300 1,200  
Increase (decrease) of interest on income taxes expense   89 (564) $ 103
Unrecognized tax benefits, interest on income taxes accrued   493 485  
Unrecognized tax benefits, interest on income taxes accrued, decrease resulting from divestiture   75    
Unrecognized accrued interest decrease as a result of cash payments   5 13  
Decrease in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit   50    
Noncurrent Deferred Tax Assets And Other Noncurrent Tax Assets [Member]        
Income Tax Contingency [Line Items]        
Deferred tax assets associated with unrecognized tax benefits   1,100 1,000  
Deferred Tax Liabilities, Net, Noncurrent [Member]        
Income Tax Contingency [Line Items]        
Deferred tax assets associated with unrecognized tax benefits   122 109  
Other Taxes Payable [Member]        
Income Tax Contingency [Line Items]        
Deferred tax assets associated with unrecognized tax benefits   46    
Unrecognized tax benefits, interest on income taxes accrued   486 465  
Income Taxes Payable [Member]        
Income Tax Contingency [Line Items]        
Unrecognized tax benefits, interest on income taxes accrued   $ 7 $ 20