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Goodwill and Intangible Assets - Changes in Goodwill and Intangible Assets (Details)
9 Months Ended
Sep. 30, 2019
USD ($)
Goodwill  
Balance at January 1, 2019 $ 20,725,000,000
Currency (366,000,000)
Divestiture (43,000,000)
Acquisition 149,000,000
Asset impairments 0
Balance at September 30, 2019 20,465,000,000
Intangible Assets, at cost  
Balance at January 1, 2019 19,529,000,000
Currency (341,000,000)
Divestiture 0
Acquisition 138,000,000
Asset impairments (57,000,000)
Balance at September 30, 2019 $ 19,269,000,000