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Changes in Goodwill and Intangible Assets (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Goodwill And Intangible Assets [Line Items]    
Goodwill beginning balance   $ 20,276
Goodwill, Currency   651
Goodwill, Divestitures $ (23) (23)
Goodwill, Acquisition 12 12
Goodwill, Asset impairment   0
Goodwill, Other   (1)
Goodwill ending balance 20,915 20,915
Intangible Assets, at Cost beginning balance   19,319
Intangible Assets, Currency   634
Intangible Assets, Divestitures (62) (62)
Intangible Assets, Acquisition   0
Intangible Assets, Asset impairment (38) (38)
Intangible Assets, Other   1
Intangible Assets, at Cost ending balance $ 19,854 $ 19,854