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Changes in Goodwill and Intangible Assets (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Goodwill And Intangible Assets [Line Items]  
Goodwill beginning balance $ 20,276
Goodwill, Currency 239
Goodwill ending balance 20,515
Intangible Assets, at Cost beginning balance 19,319
Intangible Assets, Currency 259
Intangible Assets, at Cost ending balance $ 19,578