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Debt - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Short-term debt and current portion of long-term debt:    
Short-term debt, weighted-average interest rate 1.98% 2.69%
Short-term debt $ 425,676 $ 81,522
Current portion of long-term debt, including finance leases 728,888 855,609
Total short-term debt and current portion of long-term debt 1,154,564 937,131
Total long-term debt:    
Total long-term debt 7,524,987 6,585,843
Debt issuance costs (25,875) (18,088)
Total after fair market value adjustment 7,499,112 6,567,755
Current portion of long-term debt, including finance leases (728,888) (855,609)
Long-term debt 6,770,224 5,712,146
Total debt 7,924,788 6,649,277
Unamortized original issue discounts 6,000 7,000
Fair market value adjustment on notes subject to hedging $ 462 $ 10,000
U.S. commercial paper    
Total long-term debt:    
Weighted-Average Interest Rate 1.99% 2.78%
Total long-term debt $ 119,690 $ 454,397
Canadian commercial paper    
Total long-term debt:    
Weighted-Average Interest Rate 2.04% 2.28%
Total long-term debt $ 107,128 $ 123,491
Trade receivables program    
Total long-term debt:    
Weighted-Average Interest Rate 0.00% 3.15%
Total long-term debt $ 0 $ 200,000
Global revolving credit facility    
Total long-term debt:    
Weighted-Average Interest Rate 2.10% 3.25%
Total long-term debt $ 8,104 $ 12,581
Unsecured U.S. notes – Medium-term notes    
Total long-term debt:    
Weighted-Average Interest Rate 3.17% 3.22%
Total long-term debt $ 5,965,064 $ 4,853,496
Unsecured U.S. obligations    
Total long-term debt:    
Weighted-Average Interest Rate 2.79% 3.50%
Total long-term debt $ 200,000 $ 50,000
Unsecured foreign obligations    
Total long-term debt:    
Weighted-Average Interest Rate 2.18% 1.61%
Total long-term debt $ 265,910 $ 216,719
Asset-Backed US Obligations    
Total long-term debt:    
Weighted-Average Interest Rate 2.50% 2.37%
Total long-term debt $ 807,374 $ 627,707
Finance lease obligations    
Total long-term debt:    
Weighted-Average Interest Rate 8.18% 7.97%
Total long-term debt $ 51,717 $ 47,452
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Swap    
Total long-term debt:    
Aggregate notional amount of interest rate swaps $ 525,000 $ 725,000