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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share [Abstract]        
Income from continuing operations $ 97 $ 88 $ 145 $ 162
Less: Noncontrolling interests 4 3 12 6
Less: Preferred stock dividend requirements 7 7 15 15
Income from continuing operations available to common stockholders - Numerator basic 86 78 118 141
Preferred stock dividend requirements 7 7 15 15
Numerator diluted 93 85 133 156
Net income available to common stockholders 85 79 119 141
Preferred stock dividend requirements 7 7 15 15
Numerator diluted $ 92 $ 86 $ 134 $ 156
Weighted-average number of shares outstanding - Denominator basic 145.9 147.9 146.9 147.7
Employee compensation-related shares, including stock options 1.4 2.0 1.6 2.3
Conversion of preferred stock 64.6 64.7 64.6 64.7
Denominator diluted 211.9 214.6 213.1 214.7