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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Reorganizations [Abstract]        
Revenue from discontinued operations $ 624 $ 1,070 $ 1,701 $ 2,142
Income from discontinued operations before income taxes $ 21 $ 58 $ 83 $ 118