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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Income from continuing operations $ 92 $ 97 $ 130 $ 145
Less: Noncontrolling interests 4 4 7 12
Preferred stock dividend requirements 2 7 5 15
Income (loss) from continuing operations available to common stockholders - Numerator basic 86 86 118 118
Numerator diluted 88 93 123 133
Net income available to common stockholders 84 85 115 119
Numerator diluted $ 86 $ 92 $ 120 $ 134
Weighted-average number of shares outstanding - Denominator basic 156.7 145.9 153.7 146.9
Employee compensation-related shares, including stock options 1.3 1.4 1.2 1.6
Conversion of preferred stock 17.1 64.6 21.1 64.6
Denominator diluted 175.1 211.9 176.0 213.1