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Goodwill and Intangible Assets - Changes in Goodwill and Intangible Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill      
Balance at January 1 $ 20,848,000,000 $ 20,725,000,000  
Currency 516,000,000 17,000,000  
Divestitures 0 (43,000,000)  
Acquisitions 531,000,000 149,000,000  
Asset impairments 0 0 $ 0
Balance at December 31 21,895,000,000 20,848,000,000 20,725,000,000
Intangible Assets, at cost      
Balance at January 1 19,670,000,000 19,529,000,000  
Currency 320,000,000 60,000,000  
Divestitures 0 0  
Acquisitions 553,000,000 138,000,000  
Asset impairments (144,000,000) (57,000,000)  
Balance at December 31 $ 20,399,000,000 $ 19,670,000,000 $ 19,529,000,000