Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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+ Details

Earnings (Loss) Per Share (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Options	Dec. 31, 2012 Options	Dec. 31, 2011 Options	Jun. 29, 2009 Convertible notes 5% Convertible Senior Notes due 2014	Dec. 31, 2013 Convertible notes 1.125% Convertible Senior Notes due 2018	Aug. 16, 2013 Convertible notes 1.125% Convertible Senior Notes due 2018
Anti-dilutive shares excluded from calculation of earnings per share
Anti-dilutive shares excluded from calculation of earnings per share				7.3	12.2	12.0
Dilutive potential shares excluded from calculation of earnings per share (in shares) due to the loss position
Dilutive potential shares excluded from calculation of earnings per share (in shares) due to the loss position	3.3	6.8	4.1
Stated Interest rate (as a percent)							5.00%	1.125%	1.125%
Initial conversion price of notes (in dollars per share)							$ 19.31		$ 12.07