Debt (Schedule of Long-Term Debt) (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Long-Term Debt
Debt	$ 11,241,483,000	$ 10,984,438,000
Less: unamortized debt issuance costs	(206,607,000)	(206,739,000)
Total debt, net of unamortized debt issuance costs	11,034,876,000	10,777,699,000
Less—current portion including commercial paper	(2,620,766,000)	(2,422,329,000)
Long-term portion	$ 8,414,110,000	$ 8,355,370,000
Weighted average interest rate	3.99%	4.14%
Commercial paper
Long-Term Debt
Long term debt, current interest rate (as a percent)	2.19%
Long-term debt	$ 1,434,180,000	$ 775,488,000
Fixed rate debt:
Long-Term Debt
Long-term debt	5,215,452,000	4,542,982,000
Senior notes
Long-Term Debt
Long-term debt	$ 1,746,280,000	1,724,194,000
Secured senior notes
Long-Term Debt
Long term debt, stated interest rate (as a percent)	7.25%
Long-term debt	$ 662,398,000	670,437,000
Unsecured term loans
Long-Term Debt
Long-term debt	2,806,774,000	2,148,351,000
Total variable rate debt
Long-Term Debt
Long-term debt	$ 5,795,773,000	6,310,512,000
Unsecured revolving credit facilities
Long-Term Debt
Long term debt, current interest rate (as a percent)	2.79%
Long-term debt	$ 165,000,000	795,000,000
Long term debt, facility fee (as a percent)	0.125%
Unsecured revolving credit facilities \| $1.7 billion unsecured revolving credit facility
Long-Term Debt
Long term debt, current interest rate (as a percent)	2.91%
Long term debt, principal amount	$ 1,700,000,000
Unsecured revolving credit facilities \| $1.2 billion unsecured revolving credit facility
Long-Term Debt
Long term debt, current interest rate (as a percent)	2.91%
Long term debt, principal amount	$ 1,200,000,000
USD unsecured term loan
Long-Term Debt
Long-term debt	3,519,853,000	4,005,848,000
Euro unsecured term loan
Long-Term Debt
Long-term debt	676,740,000	734,176,000
Finance lease liabilities
Long-Term Debt
Long-term debt	$ 230,258,000
Finance lease liabilities
Long-Term Debt
Long-term debt		$ 130,944,000
LIBOR \| Unsecured revolving credit facilities \| $1.7 billion unsecured revolving credit facility
Long-Term Debt
Margin on floating rate base (as a percent)	1.00%
LIBOR \| Unsecured revolving credit facilities \| $1.2 billion unsecured revolving credit facility
Long-Term Debt
Margin on floating rate base (as a percent)	1.00%
Minimum \| Senior notes
Long-Term Debt
Long term debt, stated interest rate (as a percent)	2.65%
Minimum \| Unsecured term loans
Long-Term Debt
Long term debt, stated interest rate (as a percent)	2.53%
Minimum \| USD unsecured term loan
Long-Term Debt
Long term debt, current interest rate (as a percent)	2.31%
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
Long term debt, stated interest rate (as a percent)	7.50%
Maximum \| Unsecured term loans
Long-Term Debt
Long term debt, stated interest rate (as a percent)	5.41%
Maximum \| USD unsecured term loan
Long-Term Debt
Long term debt, current interest rate (as a percent)	5.64%
Maximum \| Euro unsecured term loan
Long-Term Debt
Long term debt, current interest rate (as a percent)	1.58%

Represents the aggregate of total Long-term debt and short-term debt, excluding financing costs.

No definition available.

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- Definition

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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- Definition

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

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No definition available.

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- Definition

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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- Definition

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

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- Definition

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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- Definition

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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- Definition

Weighted average interest rate of debt outstanding.

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- Definition

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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- Definition

Amount of long-term debt and lease obligation, classified as noncurrent.

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- Definition

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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