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Goodwill and Intangible Assets - Changes in Goodwill and Intangible Assets (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Goodwill  
Balance at January 1, 2018 $ 21,085
Currency/other 216
Balance at March 31, 2018 21,301
Intangible Assets, at cost  
Balance at January 1, 2018 20,057
Currency/other 237
Balance at March 31, 2018 $ 20,294