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Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock based compensation expense
Total stock-based compensation expense, before income taxes	$ 30	$ 26	$ 25
Income tax benefit	(11)	(10)	(10)
Total stock-based compensation expense, net of income taxes	19	16	15
Unrecognized compensation cost for all stock-based compensation awards	$ 32
Weighted average period for recognition of unrecognized compensation cost for all stock-based compensation awards	1 year 8 months
Tax benefit from exercise of stock options and other awards	$ 5
System operations expense
Stock based compensation expense
Total stock-based compensation expense, before income taxes	3	3	3
Selling, general and administrative expense
Stock based compensation expense
Total stock-based compensation expense, before income taxes	27	23	22
Long-Term Incentive Plans | Stock Options
Stock based compensation expense
Total stock-based compensation expense, before income taxes	6	11	11
Long-Term Incentive Plans | Restricted Stock Units
Stock based compensation expense
Total stock-based compensation expense, before income taxes	19	14	13
Long-Term Incentive Plans | Performance Shares
Stock based compensation expense
Total stock-based compensation expense, before income taxes	4	0	0
Non-Employee Directors' Plan
Stock based compensation expense
Total stock-based compensation expense, before income taxes	$ 1	$ 1	$ 1

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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-Section 50
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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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