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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance beginning of year $ 187 $ 209 $ 159
Additions (Deductions) charged to costs and expenses 17 6 52
Charge off's and other (43) (28) (2)
Balance end of year 161 187 209
Reserve for Excess and Obsolete Inventories [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance beginning of year 800 1,017 500
Additions (Deductions) charged to costs and expenses 49 114 606
Charge off's and other (205) (331) (89)
Balance end of year 644 800 1,017
Valuation Allowance for Deferred Tax Assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance beginning of year 1,202 544 63
Additions (Deductions) charged to costs and expenses 49 280 476
Charge off's and other (296) 378 5
Balance end of year 955 1,202 544
Warranty Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance beginning of year 135 172 244
Additions (Deductions) charged to costs and expenses 38 46 50
Charge off's and other (68) (83) (122)
Balance end of year $ 105 $ 135 $ 172