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Earnings Per Share - Reconciling Weighted-Average Number of Shares Used in Earnings Per Share Calculations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Earnings Per Share [Abstract]    
Income from continuing operations $ 48 $ 74
Less: Noncontrolling interests 8 3
Less: Preferred stock dividend requirements 8 8
Income from continuing operations available to common stockholders - Numerator basic 32 63
Preferred stock dividend requirements 8 8
Numerator diluted 40 71
Net income available to common stockholders 34 62
Preferred stock dividend requirements 8 8
Numerator diluted $ 42 $ 70
Weighted-average number of shares outstanding - Denominator basic 148.0 147.5
Employee compensation-related shares, including stock options 1.7 2.5
Conversion of preferred stock 64.7 64.7
Denominator diluted 214.4 214.7