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Goodwill and Intangible Assets - Changes in Goodwill and Intangible Assets (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Goodwill  
Balance at January 1, 2018 $ 20,725
Currency (39)
Balance at March 31, 2019 20,686
Intangible Assets, at cost  
Balance at January 1, 2018 19,529
Currency 1
Balance at March 31, 2018 $ 19,530