Debt (Debt With A Contractual Term Greater Than One Year) (Detail) - USD ($) $ in Thousands	6 Months Ended
Jul. 01, 2018	Dec. 31, 2017	Jun. 25, 2017
Debt Instrument [Line Items]
Gross long-term debt	$ 5,813,809	$ 5,714,527	$ 6,243,908
Less: current portion of long-term debt, net of unamortized discount and debt issuance costs	(945,463)	(1,127,269)	(1,565,558)
Long-term debt, net	4,868,346	4,587,258	4,678,350
Secured Debt
Debt Instrument [Line Items]
Less: unamortized discount and debt issuance costs	(202)	(461)	(795)
Gross long-term debt	636,068	806,860	939,872
Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Debt Instrument [Line Items]
Long-term debt, gross	166,638	174,779	138,739
Secured Debt \| Asset-Backed U.S. Commercial Paper Conduit Facility VIE [Member]
Debt Instrument [Line Items]
Long-term debt, gross	300,000	279,457	279,833
Secured Debt \| Asset-backed securitization debt
Debt Instrument [Line Items]
Long-term debt, gross	169,632	353,085	522,095
Unsecured Debt
Debt Instrument [Line Items]
Less: unamortized discount and debt issuance costs	(22,259)	(19,821)	(23,452)
Unsecured Debt \| 1.55% Medium-term notes due in 2017, issued November 2014
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 0	$ 400,000
Debt instrument, stated percentage	1.55%	1.55%	1.55%
Unsecured Debt \| 6.80% Medium-term notes due in 2018, issued May 2008
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 877,488	$ 877,488
Debt instrument, stated percentage	6.80%	6.80%	6.80%
Unsecured Debt \| 2.25% Medium-term notes due in 2019, issued January 2016
Debt Instrument [Line Items]
Long-term debt, gross	$ 600,000	$ 600,000	$ 600,000
Debt instrument, stated percentage	2.25%	2.25%	2.25%
Unsecured Debt \| Floating-Rate Medium Term Notes due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 150,000	$ 150,000	$ 150,000
Unsecured Debt \| Two Point Four Percent Medium-Term Notes Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 600,000	$ 600,000	$ 600,000
Debt instrument, stated percentage	2.40%	2.40%	2.40%
Unsecured Debt \| 2.15% Medium-term notes due in 2020, issued February 2015
Debt Instrument [Line Items]
Long-term debt, gross	$ 600,000	$ 600,000	$ 600,000
Debt instrument, stated percentage	2.15%	2.15%	2.15%
Unsecured Debt \| Floating Rate Medium Term Notes due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 450,000	$ 0	$ 0
Unsecured Debt \| Two Point Four Percent Medium-Term Notes Due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 350,000	$ 350,000	$ 350,000
Debt instrument, stated percentage	2.40%	2.40%	2.40%
Unsecured Debt \| Two Point Eighty-five Percent Medium-Term Notes Due 2021 [Member] [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 600,000	$ 600,000	$ 600,000
Debt instrument, stated percentage	2.85%	2.85%	2.85%
Unsecured Debt \| Three Point Fifty-five Percent Medium-Term Notes due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 350,000	$ 0	$ 0
Debt instrument, stated percentage	3.55%	3.55%	3.55%
Unsecured Debt \| Two Point Fifty-five Percent Medium-Term Notes Due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 400,000	$ 400,000	$ 400,000
Debt instrument, stated percentage	2.55%	2.55%	2.55%
Unsecured Debt \| Three Point Thirty-five Percent Medium Term Notes Due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 350,000	$ 0	$ 0
Debt instrument, stated percentage	3.35%	3.35%	3.35%
Unsecured Debt \| Three Point Five Percent Senior Unsecured Notes Due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 450,000	$ 450,000	$ 450,000
Debt instrument, stated percentage	3.50%	3.50%	3.50%
Unsecured Debt \| Four Point Six Two Five Percent Senior Unsecured Notes Due 2045 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 300,000	$ 300,000	$ 300,000
Debt instrument, stated percentage	4.625%	4.625%	4.625%
London Interbank Offered Rate (LIBOR) [Member] \| Unsecured Debt \| Floating-Rate Medium Term Notes due 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on floating rate	0.35%
London Interbank Offered Rate (LIBOR) [Member] \| Unsecured Debt \| Floating Rate Medium Term Notes due 2020 [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on floating rate	0.50%

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Data Type:	num:percentItemType
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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