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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Weighted average interest rate of debt outstanding.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Jul. 31, 2018	Dec. 31, 2017
Long-Term Debt
Total debt (3)	$ 10,984,438		$ 7,706,604
Less: unamortized debt issuance costs	(206,739)		(167,153)
Total debt, net of unamortized debt issuance costs	10,777,699		7,539,451
Less—current portion including commercial paper	(2,422,329)		(1,188,514)
Long-term portion	$ 8,355,370		$ 6,350,937
Weighted average interest rate	4.14%		3.92%
Commercial paper
Long-Term Debt
Long term debt, current interest rate (as a percent)	3.19%
Long-term debt	$ 775,488		$ 0
Total fixed rate debt
Long-Term Debt
Long-term debt	4,542,982		2,199,710
Senior notes
Long-Term Debt
Debt Fixed Rate		7.25%
Long-term debt	$ 1,724,194		1,866,359
Secured senior notes
Long-Term Debt
Debt Fixed Rate	7.25%
Long-term debt	$ 670,437		0
Unsecured term loans
Long-Term Debt
Long-term debt	2,148,351		333,351
Total variable rate debt
Long-Term Debt
Long-term debt	$ 6,310,512		5,473,755
Unsecured revolving credit facilities
Long-Term Debt
Long term debt, current interest rate (as a percent)	3.91%
Long-term debt	$ 795,000		580,000
Margin on floating rate base (as a percent)	1.10%
Long term debt, facility fee (as a percent)	0.15%
Unsecured revolving credit facilities \| $1.4 billion unsecured revolving credit facility
Long-Term Debt
Long term debt, principal amount	$ 1,400,000
Unsecured revolving credit facilities \| $1.2 billion unsecured revolving credit facility
Long-Term Debt
Long term debt, principal amount	1,200,000
USD unsecured term loan
Long-Term Debt
Long-term debt	4,005,848		4,079,670
Euro unsecured term loan
Long-Term Debt
Long-term debt	734,176		814,085
Capital lease obligations
Long-Term Debt
Long-term debt	$ 130,944		$ 33,139
Minimum \| Senior notes
Long-Term Debt
Debt Fixed Rate	2.65%
Minimum \| Unsecured term loans
Long-Term Debt
Debt Fixed Rate	2.53%
Minimum \| Unsecured revolving credit facilities
Long-Term Debt
Long term debt, current interest rate (as a percent)	3.54%
Minimum \| USD unsecured term loan
Long-Term Debt
Long term debt, current interest rate (as a percent)	2.92%
Minimum \| Euro unsecured term loan
Long-Term Debt
Long term debt, current interest rate (as a percent)	1.15%
Maximum \| Senior notes
Long-Term Debt
Debt Fixed Rate	7.50%
Maximum \| Unsecured term loans
Long-Term Debt
Debt Fixed Rate	5.41%
Maximum \| Unsecured revolving credit facilities
Long-Term Debt
Long term debt, current interest rate (as a percent)	3.61%
Maximum \| USD unsecured term loan
Long-Term Debt
Long term debt, current interest rate (as a percent)	6.52%
Maximum \| Euro unsecured term loan
Long-Term Debt
Long term debt, current interest rate (as a percent)	1.58%