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Qualifying And Valuation Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Doubtful Accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 127 $ 110 $ 119
Additions Charged to costs and expenses 4 16 30
Charged (credited) to other account [1],[2] 8 11 (10)
Deductions from reserves (19) (10) (29)
Balance at end of period 120 127 110
Deferred tax asset valuation allowance      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 150 135 129
Additions Charged to costs and expenses 350 16 30
Charged (credited) to other account [1],[2]   3 (16)
Deductions from reserves (17) (4) (8)
Balance at end of period $ 483 $ 150 $ 135
[1] Amounts include adjustments related to the divestiture of the BioSciences business.
[2] Valuation accounts of acquired or divested companies and foreign currency translation adjustments.