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Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 481 $ 482 $ 516
Addition Charged to Costs and Expenses 575 84 77
Charged to Other Accounts [1] 26 (39) (42)
Deductions [2] 60 46 69
Balance at End of Period 1,022 481 482
Allowance for Trade Receivables      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 58 54 66
Addition Charged to Costs and Expenses 21 18 14
Charged to Other Accounts [1] (8) (1) (11)
Deductions [2] 21 13 15
Balance at End of Period 50 58 54
Allowance for Other Current Receivables      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 93 109 91
Addition Charged to Costs and Expenses 6 (2) 12
Charged to Other Accounts [1] 6 (13) 7
Deductions [2] 7 1 1
Balance at End of Period 98 93 109
Allowance for Long Term Receivables      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 20 16 14
Addition Charged to Costs and Expenses (1) 1 5
Charged to Other Accounts [1] 3 3 (3)
Deductions [2] 1 0 0
Balance at End of Period 21 20 16
Allowance for Deferred Taxes      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 310 303 345
Addition Charged to Costs and Expenses 549 67 46
Charged to Other Accounts [1] 25 (28) (35)
Deductions [2] 31 32 53
Balance at End of Period $ 853 $ 310 $ 303
[1] Primarily related to divestitures, acquisitions and currency translation.
[2] Represents charges for which allowances were created.