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Taxes on Income - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax [Line Items]        
Transition tax $ 117      
Decrease in deferred tax liability     $ 2,000  
Measurement period adjustment   $ 124    
Transition tax for accumulated foreign earnings   5,500    
Transition tax for accumulated foreign earnings, liability 3,400   5,300  
Provisional income tax benefit     779  
Income tax benefit   32    
Deferred tax assets on NOL carryforwards relating to foreign jurisdictions 762      
Deferred tax assets relating to various U.S. tax credit carryforwards and NOL carryforwards 135      
Income taxes paid 4,500 1,500 4,900  
Tax benefits relating to stock option exercises 65 77 73  
Unrecognized tax benefits 1,225 1,893 1,723 $ 3,494
Favorable net impact to income tax provision if unrecognized tax benefits were recognized 1,100      
Reasonably possible amount that liability for unrecognized tax benefits could decline up to in next 12 months (up to) 40      
Interest and penalties associated with uncertain tax positions, expense (benefit) (101) 51 183  
Liabilities for accrued interest and penalties 243 372    
Unrecognized tax benefits from adjustments related to examination 356 $ 91 1,388  
Foreign Jurisdiction        
Income Tax [Line Items]        
Valuation allowance on foreign NOL carryforwards 1,100      
Federal | Internal Revenue Service (IRS)        
Income Tax [Line Items]        
Income taxes paid 107   2,800  
Unrecognized tax benefits from adjustments related to examination 364   $ 234  
Income Taxes Payable        
Income Tax [Line Items]        
Transition tax liability, current 390      
Other Noncurrent Liabilities        
Income Tax [Line Items]        
Transition tax liability, noncurrent $ 3,000