Investments, Available-for-Sale Investments (Detail) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Dec. 31, 2016
Available-for-sale Securities [Abstract]
Fair Value	$ 10,510
Adjusted Cost, Total	13,170		$ 14,344
Gross Unrealized Gains, Total	4,198		3,372
Gross Unrealized Losses, Total	(27)		(34)
Fair Value, Total	17,341		17,682
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds	499	$ 2,900
Available-for-sale Securities, Gross Realized Gains	266	$ 86
Due in 1 year or less, Fair Value	4,287
Due in 1-2 years, Fair Value	1,647
Due in 2-5 years, Fair Value	3,357
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	145
Instruments not due at a single maturity date, Fair Value	1,074
Corporate Debt Securities [Member]
Available-for-sale Securities [Abstract]
Adjusted Cost	4,396		3,847
Gross Unrealized Gains	7		4
Gross Unrealized Losses	(10)		(14)
Fair Value	4,393		3,837
Financial Institution Instruments [Member]
Available-for-sale Securities [Abstract]
Adjusted Cost	4,708		6,098
Gross Unrealized Gains	8		5
Gross Unrealized Losses	(10)		(11)
Fair Value	4,706		6,092
Government Debt [Member]
Available-for-sale Securities [Abstract]
Adjusted Cost	1,417		1,581
Gross Unrealized Gains	1		0
Gross Unrealized Losses	(7)		(8)
Fair Value	1,411		1,573
Marketable Equity Securities [Member]
Available-for-sale Securities [Abstract]
Adjusted Cost	2,649		2,818
Gross Unrealized Gains	4,182		3,363
Gross Unrealized Losses	0		(1)
Fair Value	$ 6,831		$ 6,180