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Debt - LT Debt (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Debt - LT Debt (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt	$ 2,942,293		$ 2,942,293		$ 3,239,115
Accounts receivable, net	7,841,851		7,841,851		8,945,463
Investment Income, Interest and Dividend	13,501	$ 12,986	42,038	$ 33,543
Revolving Credit Facility due in 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	35,000		35,000		0
Maximum Borrowing Capacity	$ 2,000,000		$ 2,000,000
Debt Instrument, Interest Rate, Effective Percentage	3.00%		3.00%
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	$ 680,000		$ 680,000		810,000
Maximum Borrowing Capacity	$ 1,200,000		$ 1,200,000
Debt Instrument, Interest Rate, Effective Percentage	2.49%		2.49%
Debt Instrument, Basis Spread on Variable Rate			0.40%
Line of Credit Facility, Commitment Fee Percentage			0.40%
Accounts receivable, net	$ 2,539,493		$ 2,539,493		2,754,400
6.00% notes, due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	0		0		209,147
Debt Instrument, Fair Value Disclosure	$ 213,000		$ 213,000		214,500
Debt Instrument, Interest Rate, Stated Percentage	6.00%		6.00%
5.125% notes, due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 130,655		$ 130,655		130,546
Debt Instrument, Fair Value Disclosure	$ 135,000		$ 135,000		134,500
Debt Instrument, Interest Rate, Stated Percentage	5.125%		5.125%
3.50% notes, due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 347,885		$ 347,885		347,288
Debt Instrument, Fair Value Disclosure	$ 357,500		$ 357,500		345,000
Debt Instrument, Interest Rate, Stated Percentage	3.50%		3.50%
4.50% notes, due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 298,014		$ 298,014		297,622
Debt Instrument, Fair Value Disclosure	$ 315,500		$ 315,500		303,500
Debt Instrument, Interest Rate, Stated Percentage	4.50%		4.50%
3.25% notes, due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 494,803		$ 494,803		494,091
Debt Instrument, Fair Value Disclosure	$ 508,000		$ 508,000		467,000
Debt Instrument, Interest Rate, Stated Percentage	3.25%		3.25%
4.00% notes, due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 346,214		$ 346,214		345,762
Debt Instrument, Fair Value Disclosure	$ 364,000		$ 364,000		340,500
Debt Instrument, Interest Rate, Stated Percentage	4.00%		4.00%
7.5% senior debentures, due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 109,837		$ 109,837		109,776
Debt Instrument, Fair Value Disclosure	$ 136,000		$ 136,000		128,000
Debt Instrument, Interest Rate, Stated Percentage	7.50%		7.50%
3.875% notes, due 2028 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 494,507		$ 494,507		494,095
Debt Instrument, Fair Value Disclosure	$ 512,500		$ 512,500		458,500
Debt Instrument, Interest Rate, Stated Percentage	3.875%		3.875%
Other obligations with various interest rates and due dates [Member]
Debt Instrument [Line Items]
Other Notes Payable, Noncurrent	$ 5,378		$ 5,378		$ 788