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Debt - LT Debt (Details) - USD ($) $ in Thousands	3 Months Ended
Debt - LT Debt (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Mar. 30, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt	$ 2,222,789		$ 2,640,129
Accounts receivable, net	7,817,019		8,482,687
Interest and dividend income	9,965	$ 14,045
Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	122,500		10,000
Maximum Borrowing Capacity	$ 2,000,000
Debt Instrument, Interest Rate, Effective Percentage	1.27%
Debt Instrument, Basis Spread on Variable Rate	1.18%
Line of Credit Facility, Commitment Fee Percentage	0.20%
North American Asset securitization program
Debt Instrument [Line Items]
Long-term debt	$ 0		400,000
Maximum Borrowing Capacity	$ 1,200,000
Debt Instrument, Interest Rate, Effective Percentage	1.37%
Debt Instrument, Basis Spread on Variable Rate	0.40%
Line of Credit Facility, Commitment Fee Percentage	0.40%
Accounts receivable, net	$ 2,099,700		2,217,800
5.125% notes, due 2021
Debt Instrument [Line Items]
Long-term debt	$ 0		130,691
Debt Instrument, Interest Rate, Stated Percentage	5.125%
3.50% notes, due 2022
Debt Instrument [Line Items]
Long-term debt	$ 348,292		348,088
Debt Instrument, Fair Value Disclosure	$ 363,000		358,500
Debt Instrument, Interest Rate, Stated Percentage	3.50%
4.50% notes, due 2023
Debt Instrument [Line Items]
Long-term debt	$ 298,284		298,148
Debt Instrument, Fair Value Disclosure	$ 324,500		316,000
Debt Instrument, Interest Rate, Stated Percentage	4.50%
3.25% notes, due 2024
Debt Instrument [Line Items]
Long-term debt	$ 495,289		495,045
Debt Instrument, Fair Value Disclosure	$ 462,000		515,500
Debt Instrument, Interest Rate, Stated Percentage	3.25%
4.00% notes, due 2025
Debt Instrument [Line Items]
Long-term debt	$ 346,523		346,368
Debt Instrument, Fair Value Disclosure	$ 375,000		367,000
Debt Instrument, Interest Rate, Stated Percentage	4.00%
7.50% senior debentures, due 2027
Debt Instrument [Line Items]
Long-term debt	$ 109,878		109,857
Debt Instrument, Fair Value Disclosure	$ 125,500		135,000
Debt Instrument, Interest Rate, Stated Percentage	7.50%
3.875% notes, due 2028
Debt Instrument [Line Items]
Long-term debt	$ 494,789		494,648
Debt Instrument, Fair Value Disclosure	$ 496,000		516,500
Debt Instrument, Interest Rate, Stated Percentage	3.875%
Other obligations with various interest rates and due dates
Debt Instrument [Line Items]
Other Notes Payable, Noncurrent	$ 7,234		$ 7,284
6.00% notes, due April 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.00%