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Acquisitions and Dispositions - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Jan. 22, 2021
Sep. 30, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Goodwill   $ 36,303 $ 36,322
Ondot      
Business Acquisition [Line Items]      
Cash and cash equivalents $ 13    
Receivables and other assets 9    
Intangible assets 142    
Goodwill 173    
Payables and other liabilities (31)    
Total consideration 306    
Less: Fair value of previously held equity interest (22)    
Total purchase price $ 284