Segment, Geographic and Other Revenue Information - Revenues By Geographic Area (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
Percentage Change In Revenue		(2.00%)		0.00%
U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues		$ 6,335	6,225	$ 12,510	12,500
Percentage Change In Revenue		2.00%		0.00%
Developed Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[2]	$ 2,228	2,334	$ 4,315	4,426
Percentage Change In Revenue	[2]	(5.00%)		(3.00%)
Developed Rest Of World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[3]	$ 1,639	1,694	$ 3,174	3,155
Percentage Change In Revenue	[3]	(3.00%)		1.00%
Emerging Markets [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[4]	$ 3,062	$ 3,214	$ 6,383	$ 6,292
Percentage Change In Revenue	[4]	(5.00%)		1.00%

[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.

[3] Developed Rest of World region includes the following markets: Japan, Canada, South Korea, Australia and New Zealand.

[4] Emerging Markets region includes, but is not limited to, the following markets: Asia (excluding Japan and South Korea), Latin America, Eastern Europe, the Middle East, Africa, Central Europe and Turkey.