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Discontinued Operations and Held-For-Sale Businesses (Schedule of Disposal Groups, Including Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Discontinued Operations and Disposal Groups [Abstract] |  |  |
Revenue | $ 689 | $ 1,043 | $ 1,661
Income (loss) from operations of discontinued businesses, before income tax | (3) | 73 | (206)
Income tax benefit (expense) | (24) | (26) | 48
Income (loss) from operations of discontinued businesses, after income tax | (27) | 47 | (158)
Net gain (loss) from disposal and impairments of discontinued businesses, after income tax | $ (152) | $ 16 | $ 86

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