Segment, Geographic and Other Revenue Information - Revenues By Geographic Area - Footnotes (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1]	$ 13,264	$ 13,466	$ 26,382	$ 26,373
Developed Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	2,228	2,334	4,315	4,426
Euro Member Countries, Euro [Member] | Developed Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues		$ 1,800	$ 1,900	$ 3,500	$ 3,600

[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 in the second quarter of 2019 and $1.9 billion in the second quarter of 2018, and were $3.5 billion in the first six months of 2019 and $3.6 billion in the first six months of 2018.