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Reconciliation of Numerators and Denominators of Earnings per Share Calculations (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]        
Income from continuing operations   $ 261 $ 315 $ 240
Less: Noncontrolling interests net income   16 15 13
Less: Preferred stock dividend requirements   25 31 31
Less: Preferred stock redemption premium 232 232      
Income from continuing operations available to common stockholders - Numerator basic   (12) 269 196
Numerator diluted   (12) 300 227
Net income (loss) available to common stockholders   (13) 269 188
Numerator diluted   $ (13) $ 300 $ 219
Weighted-average number of shares outstanding - Denominator basic   146.4 148.0 146.6
Employee compensation-related shares, including stock options      2.0 3.2
Conversion of preferred stock      64.7 65.5
Denominator diluted   146.4 214.7 215.3