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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes - Narrative (Details)          
Federal statutory rate   21.00% 21.00% 21.00%  
Income tax expense (benefit)   $ 1,580 $ (204) $ 2,339  
Deferred tax liability $ 1,401 6,168 1,401    
Excess of tax basis over book basis of intangible assets 1,232 1,177 1,232    
Valuation allowance 217 398 217 331  
Total gross unrecognized tax benefits 2,031 1,614 2,031 1,595 $ 2,181
Unrecognized tax benefits 1,600 1,200 1,600    
Income tax penalties and interest expense   (82) 105    
Accrued interest and income tax penalties 259 177 259    
Domestic tax authority          
Income Taxes - Narrative (Details)          
Operating loss carryforwards   1,500      
Tax credit carryforward   61      
State and local jurisdiction          
Income Taxes - Narrative (Details)          
Operating loss carryforwards   1,800      
Tax credit carryforward   $ 673      
Intangible Asset Transfer          
Income Taxes - Narrative (Details)          
Income tax expense (benefit) 1,200   (1,200) 588  
Deferred tax liability       $ 588  
Excess of tax basis over book basis of intangible assets $ 1,200   $ 1,200