Investments, Available-for-Sale Debt Investments (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 30, 2017
Available-for-sale Securities [Abstract]
Fair Value	$ 6,228
Available-for-sale Securities, Amortized Cost Basis	6,278	$ 6,642
Gross Unrealized Gains, Total	6	7
Gross Unrealized Losses, Total	(56)	(28)
Fair Value, Total	6,228	6,621
Due in 1 year or less, Fair Value	3,011
Due in 1-2 years, Fair Value	1,115
Due in 2-5 years, Fair Value	1,887
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	69
Instruments not due at a single maturity date, Fair Value	146
Corporate Debt Securities [Member]
Available-for-sale Securities [Abstract]
Adjusted Cost	2,054	2,294
Gross Unrealized Gains	2	4
Gross Unrealized Losses	(27)	(13)
Fair Value	2,029	2,285
Fixed Income Securities [Member]
Available-for-sale Securities [Abstract]
Adjusted Cost	3,433	3,387
Gross Unrealized Gains	4	3
Gross Unrealized Losses	(16)	(9)
Fair Value	3,421	3,381
Government Debt [Member]
Available-for-sale Securities [Abstract]
Adjusted Cost	791	961
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(13)	(6)
Fair Value	$ 778	$ 955

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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-Publisher FASB
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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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This item represents the cost of debt and equity 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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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth 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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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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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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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 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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