Cash and Investments, Available-for-Sale Investments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 28, 2015	Mar. 29, 2014	Dec. 27, 2014
Available-for-sale Securities [Abstract]
Adjusted Cost	$ 6,720
Fair Value	6,729
Adjusted Cost, Total	10,020		9,253
Gross Unrealized Gains, Total	3,272		3,794
Gross Unrealized Losses, Total	(14)		(9)
Fair Value, Total	13,278us-gaap_AvailableForSaleSecurities		13,038us-gaap_AvailableForSaleSecurities
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds	43	279
Available-for-sale Securities, Gross Realized Gains	43	67
Due in 1 year or less, Cost	4,697
Due in 1-2 years, Cost	864
Due in 2-5 years, Cost	779
Instruments not due at a single maturity date, Cost	380
Due in 1 year or less, Fair Value	4,707
Due in 1-2 years, Fair Value	865
Due in 2-5 years, Fair Value	778
Instruments not due at a single maturity date, Fair Value	379
Cash and Cash Equivalents [Member]
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds	0	105
Asset-Backed Securities [Member]
Available-for-sale Securities [Abstract]
Adjusted Cost	8		8
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(2)		(2)
Fair Value	6		6
Corporate Debt [Member]
Available-for-sale Securities [Abstract]
Adjusted Cost	2,609		2,040
Gross Unrealized Gains	15		13
Gross Unrealized Losses	(5)		(5)
Fair Value	2,619		2,048
Financial Institution Instruments [Member]
Available-for-sale Securities [Abstract]
Adjusted Cost	3,452		3,146
Gross Unrealized Gains	1		2
Gross Unrealized Losses	(1)		(1)
Fair Value	3,452		3,147
Government Debt [Member]
Available-for-sale Securities [Abstract]
Adjusted Cost	651		741
Gross Unrealized Gains	1		0
Gross Unrealized Losses	0		(1)
Fair Value	652		740
Marketable Equity Securities [Member]
Available-for-sale Securities [Abstract]
Adjusted Cost	3,300		3,318
Gross Unrealized Gains	3,255		3,779
Gross Unrealized Losses	(6)		0
Fair Value	$ 6,549		$ 7,097

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the remainder of the fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of available-for-sale debt securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period.

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