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Debt (Tables)
12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Long-term Debt
Long-term debt
 
Due Date
 
2017
 
2016
 
2015
2.25% Senior Notes (1)
2020
 
$
1,493,106

 


 
 
3.45% Senior Notes (1)
2027
 
1,483,244

 
 
 
 
2.75% Senior Notes (1)
2022
 
1,240,758

 
 
 
 
4.50% Senior Notes (1)
2047
 
1,228,647

 
 
 
 
Term Loan
2022
 
847,337

 
 
 
 
3.125% Senior Notes (1)
2024
 
495,602

 
 
 
 
4.20% Senior Notes (2)
2022
 
422,370

 


 
 
3.45% Senior Notes
2025
 
397,260

 
$
396,898

 
$
396,536

4.55% Senior Notes
2045
 
393,859

 
393,637

 
393,414

3.95% Senior Notes (2)
2026
 
362,381

 


 
 
7.25% Senior Notes (2)
2019
 
319,394

 


 
 
4.00% Senior Notes
2042
 
296,094

 
295,938

 
295,781

Floating Rate Loan
2021
 
269,247

 
 
 
 
3.30% Senior Notes (2)
2025
 
249,207

 


 
 
4.40% Senior Notes (2)
2045
 
238,334

 


 
 
7.375% Debentures
2027
 
118,982

 
118,936

 
118,889

0.92% Fixed Rate Loan
2021
 
23,933

 
 
 
 
7.45% Debentures
2097
 
3,500

 
3,500

 
3,500

2.00% to 8.0% Promissory Notes
Through 2027
 
2,490

 
2,417

 
1,628

1.35% Senior Notes
2017
 


 


 
697,530

 
 
 
$
9,885,745

 
$
1,211,326

 
$
1,907,278

 
 
 
 
 
 
 
 
(1) Senior notes issued in 2017 to fund the Acquisition (2) Senior notes acquired in 2017 through the Acquisition