Earnings Per Share (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Basic and diluted net earnings per share:
Net income	$ 41	$ 63
Shares
Weighted average common shares outstanding	185,573	184,963
Add: Participating securities	234	435
Weighted average common shares outstanding - Basic (in shares)	185,807	185,398
Plus incremental shares from assumed conversions:
Weighted average common shares outstanding - Diluted (in shares)	186,435	185,859
Basic earnings per share (usd per share)	$ 0.22	$ 0.34
Diluted earnings per share (usd per share)	$ 0.22	$ 0.34
Stock Options
Plus incremental shares from assumed conversions:
Dilutive effect of common shares	178	289
Restricted Stock
Plus incremental shares from assumed conversions:
Dilutive effect of common shares	450	172

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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