Stock Compensation Plans Compensation and Unrecognized Compensation Expense Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation expense
Total stock-based compensation expense	$ 34	$ 44	$ 41
Tax benefits recognized for stock-based compensation	13	17	16
Stock Awards
Compensation expense
Total stock-based compensation expense	34	44	40
Realized tax benefits from issuance of stock in settlement of RPSRs and RSRs	53	32	14
Stock Options
Compensation expense
Total stock-based compensation expense			1
Realized tax benefits from exercise of stock options	5	4	1
Restricted stock rights
Unrecognized compensation expense
Unrecognized compensation expense associated with stock awards	1
Weighted average period of recognition of unrecognized compensation expense	2 years 5 months
Restricted performance stock rights
Unrecognized compensation expense
Unrecognized compensation expense associated with stock awards	$ 21
Weighted average period of recognition of unrecognized compensation expense	8 months

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Disclosure of the aggregate tax benefit realized from the issuance of stock and settlement of RPSRs and RSRs.

+ References

No definition available.

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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 50

-Paragraph 1

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

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-Subparagraph (SAB TOPIC 14.F)

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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

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