Schedule of Consolidated Debt (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term Line of Credit	$ 577	$ 636
Long-term Debt	2,289	2,349
Total Long Term Debt, Senior Notes	1,185	1,185
Total Long Term Debt, Tax Exempt Bonds	459	459
Current portion of long-term debt	(10)	(10)
Long-term debt, Noncurrent	2,279	2,339
Project Debt	165	174
Current portion of project debt	(24)	(23)
Project Debt Noncurrent	141	151
Debt, Total	2,454	2,523
Debt, Current	(34)	(33)
Debt, Noncurrent	2,420	2,490
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	$ 387	445
Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.62%
Long-term Debt	$ 190	191
3.63% - 4.25% Equipment Financing Capital Lease [Member]
Debt Instrument [Line Items]
Capital Lease Obligations	$ 68	$ 69
Maximum [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.38%
Minimum [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.13%

Debt, Noncurrent

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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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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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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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