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Quarterly Financial Results and Market for Company's Stock (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016
Income Statement [Abstract] |  |  |  |  |  |  |  |
Business optimization, acquisition, collaboration arrangements and other benefits |  |  |  |  |  |  | $ 1,000 | $ 3,100
Business optimization, acquisition, collaboration arrangements and other charges | $ 388 | $ 82 | $ 57 | $ 17 | $ 47 | $ 155 |  |

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