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Goodwill and Intangible Assets - Changes in Goodwill and Intangible Assets (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Goodwill  
Balance at January 1, 2018 $ 21,085
Currency/other (420)
Acquisition 337
Balance at June 30, 2018 21,002
Intangible Assets, at cost  
Balance at January 1, 2018 20,057
Currency/other (441)
Acquisition 210
Balance at June 30, 2018 $ 19,826