Summary Of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013	Dec. 31, 2013 Termination Of A - 12 Program [Member]	Sep. 28, 2014 Axle Business [Member]
Loss Contingencies [Line Items]
Asset Impairment Charges						$ 106
Loss Contingency, Settlement Agreement, Consideration					198
Length of fiscal quarters, weeks			0 years 0 months 91 days
Net increase in operating earnings from the quarterly impact of revisions in contract	$ 13	$ 105	$ 103	$ 296
Net increase in operating earnings per share from the quarterly impact of revisions in contract	$ 0.02	$ 0.19	$ (0.20)	$ 0.54