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Special Retention Awards Vesting Percentage.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year).

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The amount of expense reported during the period resulting from the transaction in which equity securities were issued to pay for goods or nonemployee services.

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Share Based Compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Additional Share Based Compensation (Textual) [Abstract]
Authorized common stock grant under LTIP	12,700,000
Share Reserve For Future Grant	4,500,000
Share Based Arrangement Expense	$ 21	$ 23	$ 21
Income tax (benefit) expense	0	0	0
Intrinsic Value of stock option exercised	1	1
Cash received from stock option exercised	1	1
Net Operating Loss Carry Forward	13
Stock Options [Member]
Share Based Compensation (Textual) [Abstract]
Vesting period	four equal annual installments beginning one year from the date of grant
Expected volatility weightings	50.00%
Share based compensation arrangement by share based payment award peer volatilities expected volatility calculation	50.00%
Expiration period for stock options	10 years
Fair value of stock option granted	$ 10.60	$ 5.92	$ 4.12
Tax Benefit	5
Unrecognized compensation cost related to nonvested share-based compensation awards	3
Cost recognized over weighted average period	2.3
Stock Option Vested Fair Value	14	9	11
Restricted Stock Units [Member]
Share Based Compensation (Textual) [Abstract]
Vesting period	four equal annual installments beginning one year from the date of grant
Special Retention Award Vesting	100% after three to five years from the date of grant
Special Retention Awards Vesting Percentage	100.00%
Unrecognized compensation cost related to nonvested share-based compensation awards	6
Cost recognized over weighted average period	2.5
Stock Option Vested Fair Value	5	8	7
Number of Shares, Granted	526,401
Restricted Stock Units [Member] \| Maximum [Member]
Share Based Compensation (Textual) [Abstract]
Period of special retention awards granted	5 years
Restricted Stock Units [Member] \| Minimum [Member]
Share Based Compensation (Textual) [Abstract]
Special Retention Awards Vesting Period Minimum	3 years
Performance Based Restricted Stock Units [Member]
Share Based Compensation (Textual) [Abstract]
Vesting period	four equal annual installments beginning one year from the date of grant
Number of Shares, Granted	35,000
Additional Restricted Stock Units [Member]
Share Based Compensation (Textual) [Abstract]
Vesting period	the satisfaction of a specified performance goal
Number of Shares, Granted	35,000
Performance Shares [Member]
Share Based Compensation (Textual) [Abstract]
Vesting period	after a three-year period based on our total stockholder return relative to the performance of the Dow Jones U.S. Construction and Materials Index, with adjustments to that index in certain circumstances, for the three-year period
Unrecognized compensation cost related to nonvested share-based compensation awards	6
Cost recognized over weighted average period	1.7
Number of Shares, Granted	227,000		350,248
Weighted Average Grant Date Fair Value, Nonvested, Granted	$ 25.40
Number of Shares Vested	293,299
Performance Shares [Member] \| Maximum [Member]
Share Based Compensation (Textual) [Abstract]
Range for number of performance shares earned Maximum	200.00%
Performance Shares [Member] \| Minimum [Member]
Share Based Compensation (Textual) [Abstract]
Range for number of performance shares earned Minimum	0.00%
Non Employee Director Deferred Stock [Member]
Share Based Compensation (Textual) [Abstract]
Deferred Stock Unit Held	163,627	107,239	81,347
Expense related to stock unit	$ 0	$ 1	$ 1
Ordinary Restricted Stock Units [Member]
Share Based Compensation (Textual) [Abstract]
Number of Shares, Granted	456,401