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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Income from continuing operations $ 72 $ 60 $ 217 $ 222
Less: Noncontrolling interests 3 4 15 10
Preferred stock dividend requirements 6 8 21 23
Less: Preferred stock redemption premium 232   232  
Income (loss) from continuing operations available to common stockholders - Numerator basic (169) 48 (51) 189
Numerator diluted (169) 56 (51) 212
Net income (loss) available to common stockholders (170) 48 (51) 189
Numerator diluted $ (170) $ 56 $ (51) $ 212
Weighted-average number of shares outstanding - Denominator basic 145.8 148.1 146.6 147.8
Employee compensation-related shares, including stock options    1.7    2.2
Conversion of preferred stock    64.7    64.7
Denominator diluted 145.8 214.5 146.6 214.7