Asset Securitization Program Facility Fee.

No definition available.

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Period Type:	instant

- Definition

Asset Securitization Program Interest Rate At Period End.

+ References

No definition available.

+ Details

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ 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(3))
-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 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611

+ Details

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

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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(a)(1))
-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 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

+ Details

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

- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(a),(b))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term notes classified as other, payable after one year or the normal operating cycle, if longer.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

+ Details

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Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_LineOfCreditMember
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Debt - LT Debt (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
Debt - LT Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Apr. 01, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Loss on extinguishment of debt			$ (59,545)
Long-term debt	$ 3,533,050		2,933,045
Accounts receivable, net	7,378,453		8,125,588
Investment Income, Interest and Dividend	9,255	$ 7,926
Revolving Credit Facility due in 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 281,500		0
Debt Instrument, Basis Spread on Variable Rate	1.18%
Debt Instrument, Interest Rate, Effective Percentage	2.87%
Line of Credit Facility, Commitment Fee Percentage	0.20%
Maximum Borrowing Capacity	$ 1,800,000
Asset securitization program [Member]
Debt Instrument [Line Items]
Long-term debt	$ 810,000		490,000
Debt Instrument, Interest Rate, Effective Percentage	2.27%
Asset Securitization Program Facility Fee	0.40%
Asset Securitization Program Interest Rate Spread At End of Period	0.40%
Accounts receivable, net	$ 2,109,500		$ 2,270,500
Maximum Borrowing Capacity	910,000
Senior Debentures Due in 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.875%
3.00% notes, due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	0		$ 300,500
Debt Instrument, Face Amount	300,000
6.00% notes, due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	220,500		$ 224,000
Debt Instrument, Interest Rate, Stated Percentage			6.00%
Long-term debt	209,015		$ 208,971
5.125% notes, due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	137,000		$ 139,000
Debt Instrument, Interest Rate, Stated Percentage			5.125%
Long-term debt	130,436		$ 130,400
3.50% notes, due in 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	349,000		355,000
Long-term debt	346,708		346,518
4.50% notes, due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	309,500		315,500
Long-term debt	297,245		297,122
3.25% notes, due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	479,000		$ 491,000
Debt Instrument, Interest Rate, Stated Percentage			3.25%
Long-term debt	493,389		$ 493,161
Debt Instrument, Face Amount			500,000
Proceeds from note offering, net			493,810
4.00% notes, due in 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	348,500		356,500
Long-term debt	345,325		345,182
7.5% senior debentures, due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	134,000		$ 138,500
Debt Instrument, Interest Rate, Stated Percentage			7.50%
Long-term debt	109,714		$ 109,694
3.875% Notes Due in 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	485,500		$ 501,000
Debt Instrument, Interest Rate, Stated Percentage			3.875%
Long-term debt	493,694		$ 493,563
Debt Instrument, Face Amount			500,000
Proceeds from note offering, net			494,625
Other obligations with various interest rates and due dates [Member]
Debt Instrument [Line Items]
Other Notes Payable, Noncurrent	16,024		$ 18,434
Line of Credit [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity	$ 100,000
3.00% notes, due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			3.00%