Schedule of Consolidated Debt (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term line of credit	$ 672	$ 606
Long-term Debt	2,408	2,342
Total Long Term Debt, Senior Notes	1,184	1,184
Total Long Term Debt, Tax Exempt Bonds	489	488
Current portion of long-term debt	(15)	(15)
Long-term debt, Noncurrent	2,393	2,327
Project Debt	141	152
Current portion of project debt	(10)	(19)
Project Debt Noncurrent	131	133
Debt, Total	2,549	2,494
Debt, Current	(25)	(34)
Debt, Noncurrent	$ 2,524	2,460
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Fixed interest rate	4.38%
Long-term line of credit	$ 281	212
Term Loan [Member]
Debt Instrument [Line Items]
Fixed interest rate	4.47%
Equipment Financing Capital Lease [Member]
Debt Instrument [Line Items]
Capital Lease Obligations	$ 63	$ 64
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative, fixed interest rate	2.132%

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Debt, Total

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Total project debt.

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Project debt current.

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Project debt noncurrent.

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Total Long Term Debt, Senior Notes and Debentures

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Total Long Term Debt, Tax Exempt Bonds

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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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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Weighted average interest rate of debt outstanding.

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Fixed interest rate related to the interest rate derivative.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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