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Goodwill and Intangible Assets - Changes in Goodwill and Intangible Assets (Details) - USD ($)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Goodwill    
Balance at January 1, 2021 $ 21,895,000,000  
Currency (184,000,000)  
Acquisitions 559,000,000  
Asset impairments 0 $ 0
Balance at June 30, 2021 22,270,000,000  
Intangible Assets, at cost    
Balance at January 1, 2021 20,399,000,000  
Currency (98,000,000)  
Acquisitions 405,000,000  
Asset impairments (32,000,000)  
Balance at June 30, 2021 $ 20,674,000,000