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

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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 - Long-Term Debt Maturities (Detail) $ in Thousands, € in Millions	Mar. 31, 2018 USD ($)	Jan. 31, 2018 USD ($)	Jan. 31, 2018 EUR (€)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
2018	$ 164,488
2019	447,336
2020	1,582,427
2021	878,075
2022	1,343,639
Thereafter	5,098,121
Subtotal	9,514,086
Premiums (discounts), net	(15,643)
Debt issuance costs, net	(38,266)
Total	9,460,177			$ 9,412,631
Credit Facilities [Member]
Debt Instrument [Line Items]
2018	0
2019	0
2020	336,848
2021	0
2022	0
Thereafter	0
Subtotal	336,848
Premiums (discounts), net	0
Debt issuance costs, net	0
Total	336,848			317,392
Senior Notes [Member]
Debt Instrument [Line Items]
2018	0
2019	0
2020	1,232,100
2021	862,470
2022	862,470
Thereafter	3,782,658
Subtotal	6,739,698	$ 494,200	€ 400.0
Premiums (discounts), net	(19,082)
Debt issuance costs, net	(24,869)
Total	6,695,747			6,067,277
Term Loans And Other Debt [Member]
Debt Instrument [Line Items]
2018	935
2019	1,013
2020	1,077
2021	910
2022	470,464
Thereafter	1,005,341
Subtotal	1,479,740
Premiums (discounts), net	0
Debt issuance costs, net	(9,891)
Total	1,469,849			2,060,491
Secured Mortgages [Member]
Debt Instrument [Line Items]
2018	163,553
2019	446,323
2020	12,402
2021	14,695
2022	10,705
Thereafter	310,122
Subtotal	957,800
Premiums (discounts), net	3,439
Debt issuance costs, net	(3,506)
Total	$ 957,733			$ 967,471