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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

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