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Goodwill and Intangible Assets - Changes in Goodwill and Intangible Assets (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Goodwill  
Balance at January 1, 2019 $ 20,725
Currency 20
Divestitures (43)
Acquisition (1)
Balance at June 30, 2019 20,701
Intangible Assets, at cost  
Balance at January 1, 2019 19,529
Currency 31
Divestitures 0
Acquisition 0
Balance at June 30, 2018 $ 19,560