Earnings Per Share (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Basic and diluted net earnings per share:
Net income	$ 49		$ 41
Shares
Weighted average common shares outstanding	184,505		185,573
Add: Participating securities	42	[1]	234	[1]
Weighted average common shares outstanding - Basic (in shares)	184,547		185,807
Plus incremental shares from assumed conversions:
Weighted average common shares outstanding - Diluted (in shares)	185,769		186,435
Basic earnings per share (usd per share)	$ 0.27		$ 0.22
Diluted earnings per share (usd per share)	$ 0.27		$ 0.22
Stock Options
Plus incremental shares from assumed conversions:
Dilutive effect of common shares	659	[2]	178	[2]
Restricted Stock
Plus incremental shares from assumed conversions:
Dilutive effect of common shares	563	[2]	450	[2]

[1] Restricted stock awards containing rights to non-forfeitable dividends that participate in undistributed earnings with common shareholders are considered participating securities for purposes of computing earnings per share.

[2] Incremental shares from stock options, restricted stock and performance share units are computed by the treasury stock method. The weighted average shares listed below were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive for the periods presented or were otherwise excluded under the treasury stock method. The treasury stock method calculates dilution assuming the exercise of all in-the-money options and vesting of restricted stock and performance share awards, reduced by the repurchase of shares with the proceeds from the assumed exercises, unrecognized compensation expense for outstanding awards and the estimated tax benefit of the assumed exercises. Performance share units will be included in the treasury stock calculation of diluted earnings per share upon achievement of underlying performance conditions. See Note 14, "Stock-Based Compensation Plans" for further detail on the performance share units.