Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance beginning of year	$ 132	$ 161	$ 187
Additions (Deductions) charged to costs and expenses	7	21	17
Charge off's and other	(39)	(50)	(43)
Balance end of year	100	132	161
Reserve for Excess and Obsolete Inventories [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance beginning of year	843	644	800
Additions (Deductions) charged to costs and expenses	356	659	49
Charge off's and other	(622)	(460)	(205)
Balance end of year	577	843	644
Valuation Allowance for Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance beginning of year	1,175	955	1,202
Additions (Deductions) charged to costs and expenses	(82)	218	49
Charge off's and other		2	(296)
Balance end of year	1,093	1,175	955
Environmental Accruals [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance beginning of year	104	66	38
Additions (Deductions) charged to costs and expenses	13	57	37
Charge off's and other	(27)	(19)	(9)
Balance end of year	90	104	66
Warranty Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance beginning of year	90	105	135
Additions (Deductions) charged to costs and expenses	22	41	38
Charge off's and other	(25)	(56)	(68)
Balance end of year	$ 87	$ 90	$ 105