Segment, Geographic and Other Revenue Information - Revenues By Geographic Area - Footnotes (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1]	$ 13,298	$ 13,168	$ 39,670	$ 38,843
Developed Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	2,231	2,163	6,657	6,309
Euro Member Countries, Euro [Member] | Developed Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues		$ 1,800	$ 1,700	$ 5,300	$ 5,000

[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 $1.8 billion and $1.7 billion in the third quarter of 2018 and 2017, respectively, and $5.3 billion and $5.0 billion in the first nine months of 2018 and 2017, respectively.