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Earnings Per Share - Reconciliation of the Numerators and Denominators of the Earnings Per Share Calculations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Income from continuing operations $ 38 $ 48
Less: Noncontrolling interests 3 8
Preferred stock dividend requirements 3 8
Income (loss) from continuing operations available to common stockholders - Numerator basic 32 32
Numerator diluted 35 40
Net income available to common stockholders 31 34
Numerator diluted $ 34 $ 42
Weighted-average number of shares outstanding - Denominator basic 150.7 148.0
Employee compensation-related shares, including stock options 1.1 1.7
Conversion of preferred stock 25.2 64.7
Denominator diluted 177.0 214.4