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Acquisitions and Dispositions - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Jan. 22, 2021
Mar. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Goodwill   $ 36,380 $ 36,322
Ondot      
Business Acquisition [Line Items]      
Cash and cash equivalents $ 13    
Receivables and other assets 13    
Intangible assets 92    
Goodwill 210    
Payables and other accrued liabilities (23)    
Total consideration 305    
Less: Fair value of previously held equity interest (22)    
Total purchase price $ 283