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Schedule of Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Common Stock, Shares, Outstanding beginning of period     78,085,559  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     $ 1,820  
Net Income Attributable to Parent 39 31 132 58
Net Income (Loss) Attributable to Noncontrolling Interest (1) 0 (1) (1)
Common Stock, Shares, Outstanding end of period 78,209,428   78,209,428  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 1,889   1,889  
Common Stock [Member]
        
Common Stock, Shares, Outstanding beginning of period     78,085,559 75,556,272
Issuance of common stock       2,365,000
Issuances of shares pursuant to equity-based plans     123,869 146,027
Common Stock, Shares, Outstanding end of period 78,209,428 78,067,299 78,209,428 78,067,299
Common Stock Including Additional Paid in Capital [Member]
        
Issuance of shares pursuant to equity-based plans     1 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     911 841
Issuances of common stock, net of issuance costs of $3       67
Stock-based compensation     4 2
Dividends declared     0 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 916 910 916 910
Accumulated Other Comprehensive Income (Loss) [Member]
        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     (5) (6)
Stock-based compensation     0 0
Dividends declared     0 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (5) (6) (5) (6)
Retained Earnings [Member]
        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     913 893
Stock-based compensation     0 0
Dividends declared     (67) (63)
Net Income Attributable to Parent     132 58
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 978 888 978 888
Noncontrolling Interest [Member]
        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     1 2
Stock-based compensation     0 0
Dividends declared     0 0
Net Income (Loss) Attributable to Noncontrolling Interest     (1) (1)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 0 $ 1 $ 0 $ 1