Goodwill And Other Intangible Assets (Components Of Goodwill And Other Intangible Assets) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended		24 Months Ended
	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount, January 1		$ 1,457	$ 1,391	$ 1,391
Acquisitions and purchase accounting adjustments		6	74
Foreign exchange		0	(8)
Gross carrying amount, December 31	$ 1,391	1,463	1,457	1,463
Goodwill, Accumulated Impairment		(784)	(690)	(690)
Impairment		(6)	(94)
Goodwill, Accumulated Impairment	(690)	(790)	(784)	(790)
Net carrying value, December 31		673	673	673
Gross Carrying Amount		820	823	820
Accumulated Amortization		(477)	(419)	(477)
Net Carrying Amount		343	404	343
Developed Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount		138	140	138
Accumulated Amortization		(100)	(86)	(100)
Net Carrying Amount		38	54	38
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount		682	683	682
Accumulated Amortization		(377)	(333)	(377)
Net Carrying Amount		305	350	305
Trademarks And Brand Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Net trademarks and brand names		228	230	228
Powertrain
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount, January 1		648	582	582
Acquisitions and purchase accounting adjustments		6	74
Foreign exchange		0	(8)
Gross carrying amount, December 31	582	654	648	654
Goodwill, Accumulated Impairment		(136)	(92)	(92)
Impairment		(6)	(44)
Goodwill, Accumulated Impairment	(92)	(142)	(136)	(142)
Net carrying value, December 31		512	512	512
Motorparts
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount, January 1		809	809	809
Acquisitions and purchase accounting adjustments		0	0
Foreign exchange		0	0
Gross carrying amount, December 31	809	809	809	809
Goodwill, Accumulated Impairment		(648)	(598)	(598)
Impairment	6	0	(50)	(56)
Goodwill, Accumulated Impairment	$ (598)	(648)	(648)	(648)
Net carrying value, December 31		$ 161	$ 161	$ 161