Basis of Presentation and Summary of Significant Accounting Policies Narrative (Details) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)
Summary of Significant Accounting Policies [Table] [Line Items]
Number of Reportable Segments \| Segment	1
Bank Overdrafts	$ 92	$ 77
Deferred Long-term Liability Charges	63	64
Gas Balancing Asset (Liability)	$ 5	(9)
Director [Member]
Summary of Significant Accounting Policies [Table] [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Other Noncurrent Assets [Member]
Summary of Significant Accounting Policies [Table] [Line Items]
Unamortized Debt Issuance Expense	$ 22	$ 32
Minimum [Member]
Summary of Significant Accounting Policies [Table] [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	50.00%
Minimum [Member] \| Employee [Member]
Summary of Significant Accounting Policies [Table] [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Maximum [Member] \| Employee [Member]
Summary of Significant Accounting Policies [Table] [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years

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Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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The total amount of long-term liability charges that are being deferred beyond one year.

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The value of gas balancing asset or liability as of the end of the period.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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