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Debt - LT Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 01, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities   $ 2,933,045 $ 2,696,334  
Accounts receivable, net   8,171,092 6,746,687  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months   355,588    
Long-term Debt, Maturities, Repayments of Principal in Year Two   499,371    
Long-term Debt, Maturities, Repayments of Principal in Year Three   213,432    
Long-term Debt, Maturities, Repayments of Principal in Year Four   133,384    
Long-term Debt, Maturities, Repayments of Principal in Year Five   346,804    
Long-term Debt, Maturities, Repayments of Principal after Year Five   1,738,723    
Redemption of Notes, Principal Amount       $ 250,000
Proceeds from note offering, net   986,203 0 688,162
Loss on extinguishment of debt $ 58,759 59,545 0 2,943
Investment Income, Interest and Dividend   32,599 18,680 6,301
Interest Paid   156,974 141,816 $ 133,390
Asset securitization program [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities   490,000 460,000  
Prior Maximum Borrowing Capacity   $ 900,000    
Debt Instrument, Interest Rate, Effective Percentage   1.91%    
Accounts receivable, net   $ 2,270,500 2,045,464  
Asset Securitization Program Interest Rate Spread At End of Period   0.40%    
Facility Fee   0.40%    
Maximum Borrowing Capacity   $ 910,000    
3.375% Notes, Due 2015 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage       3.375%
6.875% Senior Debentures, Due 2018 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities   0 199,348  
Debt Instrument, Fair Value   $ 0 212,500  
Debt Instrument, Interest Rate, Stated Percentage   6.875%    
3.00% Notes, Due 2018 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities   $ 0 299,013  
Debt Instrument, Fair Value   $ 300,500 303,500  
Debt Instrument, Interest Rate, Stated Percentage   3.00%    
6.00% Notes, Due 2020 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities   $ 208,971 299,183  
Debt Instrument, Fair Value   $ 224,000 325,500  
Debt Instrument, Interest Rate, Stated Percentage   6.00%    
5.125% Notes, Due 2021 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities   $ 130,400 248,843  
Debt Instrument, Fair Value   $ 139,000 265,500  
Debt Instrument, Interest Rate, Stated Percentage   5.125%    
3.50% Notes, Due 2022 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities   $ 346,518 345,776  
Debt Instrument, Fair Value   $ 355,000 349,500  
Debt Instrument, Face Amount       $ 350,000
Debt Instrument, Interest Rate, Stated Percentage   3.50%   3.50%
4.50% Notes, Due 2023 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities   $ 297,122 296,646  
Debt Instrument, Fair Value   $ 315,500 305,500  
Debt Instrument, Interest Rate, Stated Percentage   4.50%    
3.25% Notes, Due 2024 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities   $ 493,161 0  
Debt Instrument, Fair Value   491,000 0  
Debt Instrument, Face Amount   $ 500,000    
Debt Instrument, Interest Rate, Stated Percentage   3.25%    
Proceeds from note offering, net   $ 493,810    
4.00% Notes, Due 2025 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities   345,182 344,625  
Debt Instrument, Fair Value   $ 356,500 345,000  
Debt Instrument, Face Amount       $ 350,000
Debt Instrument, Interest Rate, Stated Percentage   4.00%   4.00%
7.50% Senior Debentures, Due 2027 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities   $ 109,694 198,514  
Debt Instrument, Fair Value   $ 138,500 238,000  
Debt Instrument, Interest Rate, Stated Percentage   7.50%    
3.875% Notes, Due 2028 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities   $ 493,563 0  
Debt Instrument, Fair Value   501,000 0  
Debt Instrument, Face Amount   $ 500,000    
Debt Instrument, Interest Rate, Stated Percentage   3.88%    
Proceeds from note offering, net   $ 494,625    
Other obligations with various interest rates and due dates [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities   18,434 $ 4,386  
Uncommitted Line of Credit [Member]        
Debt Instrument [Line Items]        
Maximum Borrowing Capacity   $ 100,000    
Commercial Paper [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Effective Percentage   1.78%    
Maximum Borrowing Capacity   $ 1,200,000    
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Prior Maximum Borrowing Capacity   $ 1,500,000    
Debt Instrument, Interest Rate, Effective Percentage   2.61%    
Asset Securitization Program Interest Rate Spread At End of Period   1.18%    
Facility Fee   0.20%    
Maximum Borrowing Capacity   $ 1,800,000