Goodwill And Other Intangible Assets (Components Of Goodwill And Other Intangible Assets) (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount, January 1			$ 1,391	$ 1,362
Acquisitions and purchase accounting adjustments			74	32
Foreign exchange			(8)	(3)
Gross carrying amount, December 31		$ 1,391	1,457	1,391
Goodwill, Accumulated Impairment			(690)	(570)
Impairment			(94)	(120)
Goodwill, Accumulated Impairment		(690)	(784)	(690)
Net carrying value, December 31		701	673	701
Gross Carrying Amount		714	823	714
Accumulated Amortization		(360)	(419)	(360)
Net Carrying Amount		354	404	354
Developed Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount		116	140	116
Accumulated Amortization		(73)	(86)	(73)
Net Carrying Amount		43	54	43
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount		598	683	598
Accumulated Amortization		(287)	(333)	(287)
Net Carrying Amount		311	350	311
Trademarks And Brand Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Net trademarks and brand names		227	230	227
Powertrain [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount, January 1			582	579
Acquisitions and purchase accounting adjustments			74	6
Foreign exchange			(8)	(3)
Gross carrying amount, December 31		582	648	582
Goodwill, Accumulated Impairment			(92)	(92)
Impairment			(44)	0
Goodwill, Accumulated Impairment		(92)	(136)	(92)
Net carrying value, December 31		490	512	490
Motorparts [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount, January 1			809	783
Acquisitions and purchase accounting adjustments			0	26
Foreign exchange			0	0
Gross carrying amount, December 31		809	809	809
Goodwill, Accumulated Impairment			(598)	(478)
Impairment	$ (56)	6	(50)	(120)
Goodwill, Accumulated Impairment		(598)	(648)	(598)
Net carrying value, December 31		$ 211	$ 161	$ 211