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Immaterial Corrections (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Income Statements [Abstract]      
General and administrative expenses $ (168) $ (176) $ (201)
Operating loss (247) (184) (121)
Loss from continuing operations before income tax expense (benefit) (318) (276) (208)
Loss from continuing operations (578) (132) (111)
Income tax expense (260) 144 97
Income from discontinued operations, including tax expense of $237, $330 and $275, respectively 448 807 740
Net (loss) income (130) 804 629
Earnings Per Share:      
Continuing operations $ (6.23) $ (1.44) $ (1.21)
Income from discontinued operations $ 4.83 $ 10.19 $ 8.10
Net income $ 1.40 $ 8.75 $ 6.89
As Previously Reported with Reclassification for Discontinued Operations [Member]
      
Consolidated Income Statements [Abstract]      
General and administrative expenses   (179) (195)
Operating loss   (187) (115)
Loss from continuing operations before income tax expense (benefit)   (279) (202)
Loss from continuing operations   (135) (104)
Income tax expense     98
Income from discontinued operations, including tax expense of $237, $330 and $275, respectively   933 748
Net (loss) income   798 644
Earnings Per Share:      
Continuing operations   $ (11.48) $ (1.14)
Income from discontinued operations   $ 10.16 $ 8.19
Net income   $ 8.68 $ 7.05
Adjustments [Member]
      
Consolidated Income Statements [Abstract]      
General and administrative expenses   3 (6)
Operating loss   3 (6)
Loss from continuing operations before income tax expense (benefit)   3 (6)
Loss from continuing operations   3 (7)
Income tax expense     (1)
Income from discontinued operations, including tax expense of $237, $330 and $275, respectively   3 (8)
Net (loss) income   6 (15)
Earnings Per Share:      
Continuing operations   $ 0.04 $ (0.07)
Income from discontinued operations   $ 0.03 $ (0.09)
Net income   $ 0.07 $ (0.16)
As Adjusted and with Reclassification for Discontinued Operations [Member]
      
Consolidated Income Statements [Abstract]      
General and administrative expenses   (176) (201)
Operating loss   (184) (121)
Loss from continuing operations before income tax expense (benefit)   (276) (208)
Loss from continuing operations   (132) (111)
Income tax expense     97
Income from discontinued operations, including tax expense of $237, $330 and $275, respectively   936 740
Net (loss) income   $ 804 $ 629
Earnings Per Share:      
Continuing operations   $ (1.44) $ (1.21)
Income from discontinued operations   $ 10.19 $ 8.1
Net income   $ 8.75 $ 6.89