Debt - LT Debt (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 30, 2019	Mar. 31, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt	$ 3,575,891		$ 3,239,115
Accounts receivable, net	7,902,516		8,945,463
Investment Income, Interest and Dividend	14,045	$ 9,255
Revolving Credit Facility due in 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	55,000		0
Maximum Borrowing Capacity	$ 2,000,000
Debt Instrument, Interest Rate, Effective Percentage	3.56%
Debt Instrument, Basis Spread on Variable Rate	1.18%
Line of Credit Facility, Commitment Fee Percentage	0.20%
Asset securitization program [Member]
Debt Instrument [Line Items]
Long-term debt	$ 1,090,000		810,000
Maximum Borrowing Capacity	$ 1,200,000
Debt Instrument, Interest Rate, Effective Percentage	2.94%
Debt Instrument, Basis Spread on Variable Rate	0.40%
Line of Credit Facility, Commitment Fee Percentage	0.40%
Accounts receivable, net	$ 2,436,800		2,754,400
6.00% notes, due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	209,191		209,147
Debt Instrument, Fair Value Disclosure	$ 214,500		214,500
Debt Instrument, Interest Rate, Stated Percentage	6.00%
5.125% notes, due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 130,582		130,546
Debt Instrument, Fair Value Disclosure	$ 135,500		134,500
Debt Instrument, Interest Rate, Stated Percentage	5.125%
3.50% notes, due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 347,485		347,288
Debt Instrument, Fair Value Disclosure	$ 353,000		345,000
Debt Instrument, Interest Rate, Stated Percentage	3.50%
4.50% notes, due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 297,751		297,622
Debt Instrument, Fair Value Disclosure	$ 311,500		303,500
Debt Instrument, Interest Rate, Stated Percentage	4.50%
3.25% notes, due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 494,327		494,091
Debt Instrument, Fair Value Disclosure	$ 484,500		467,000
Debt Instrument, Interest Rate, Stated Percentage	3.25%
4.00% notes, due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 345,911		345,762
Debt Instrument, Fair Value Disclosure	$ 351,000		340,500
Debt Instrument, Interest Rate, Stated Percentage	4.00%
7.5% senior debentures, due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 109,796		109,776
Debt Instrument, Fair Value Disclosure	$ 130,000		128,000
Debt Instrument, Interest Rate, Stated Percentage	7.50%
3.875% notes, due 2028 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 494,231		494,095
Debt Instrument, Fair Value Disclosure	$ 484,000		458,500
Debt Instrument, Interest Rate, Stated Percentage	3.875%
Other obligations with various interest rates and due dates [Member]
Debt Instrument [Line Items]
Other Notes Payable, Noncurrent	$ 1,617		$ 788

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.

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

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

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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.

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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.

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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.

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