Stock-Based Compensation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Stock-based compensation
Pre-tax compensation expense	$ 12	$ 17
Income tax benefit	4	6
Tax rate - before valuation allowance (as a percent)	37.00%	37.00%
Long-term stock awards
Stock-based compensation
Pre-tax compensation expense	11	9
Stock options
Stock-based compensation
Pre-tax compensation expense	1	5
Phantom stock awards and stock appreciation rights
Stock-based compensation
Pre-tax compensation expense		$ 3

Represents tax rate, before valuation allowance, applied to compensation cost for equity-based payment arrangements.

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

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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