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Segment, Geographic and Other Revenue Information - Revenues By Geographic Area - Footnotes (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | [1] | $ 53,647 | $ 52,546 | $ 52,824
Developed Europe [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | [2] | 9,116 | 8,508 | 9,306
Euro Member Countries, Euro | Developed Europe [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues |  | $ 7,300 | $ 6,800 | $ 7,200
[1] | Amounts may not add due to rounding.
[2] | Developed Europe region includes the following markets: Western Europe, Scandinavian countries and Finland. Revenues denominated in euros were $7.3 billion in 2018, $6.8 billion in 2017 and $7.2 billion in 2016.

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