Acquisitions and Divestitures - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		6 Months Ended					3 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012 Fallbrook [Member]	Sep. 30, 2012 Fallbrook [Member]	Jun. 30, 2013 Fallbrook [Member]	Sep. 30, 2013 Fallbrook [Member]	Sep. 30, 2013 Fallbrook [Member] Off-Highway	Sep. 30, 2013 Fallbrook [Member] LVD	Sep. 30, 2013 Structural Products	Dec. 31, 2012 Axle Differential and Brake Systems [Member]	Sep. 30, 2012 Axle Differential and Brake Systems [Member]	Mar. 31, 2012 Axle Differential and Brake Systems [Member]	Sep. 30, 2012 Axle Differential and Brake Systems [Member]
Business Acquisitions and Investments in Equity Affiliates [Line Items]
Business acquisition, purchase price						$ 20
Business acquisition, cash paid					5	7	8
Business acquisition, purchase price allocated to indefinite-lived intangible assets								20	12	8
Proceeds in escrow											12
Cash proceeds from divestiture of business			1	7								1	7
Asset impairment for sales of business based on our current estimate of the expected sales price				2										2
Sales of divested business															$ 32