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Spin-off of Distribution Business - Schedule of Selected Financial Information Reported as Discontinued Operations (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Reorganizations [Abstract]        
Revenue from discontinued operations    $ 1,113 $ 1,701 $ 3,255
Income from discontinued operations before income taxes    $ 58 $ 83 $ 176