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Goodwill and Intangible Assets - Changes in Goodwill and Intangible Assets (Details)
9 Months Ended
Sep. 30, 2018
USD ($)
Goodwill  
Balance at January 1, 2018 $ 21,085,000,000
Currency/other (520,000,000)
Acquisition 335,000,000
Asset impairments 0
Balance at September 30, 2018 20,900,000,000
Intangible Assets, at cost  
Balance at January 1, 2018 20,057,000,000
Currency/other (570,000,000)
Acquisition 210,000,000
Asset impairments (68,000,000)
Balance at September 30, 2018 $ 19,629,000,000