Defined Benefit Retirement Plans with Overfunded and Underfunded Status (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2010 Overfunded Pension Plans	Dec. 31, 2011 Underfunded Defined Benefit Pension Plans	Dec. 31, 2010 Underfunded Defined Benefit Pension Plans	Jan. 02, 2011 Underfunded Defined Benefit Pension Plans
Defined Benefit Plan Change In Fair Value Roll Forward [Abstract]
Fair value of plan assets at January 1	$ 197			$ 182			$ 197
Actual return on plan assets				31
Contributions					4	4
Settlement					(10)
Benefits paid				(16)	(10)	(4)
Fair value of plan assets at December 31	181	197		197	181		197
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at January 1				183	34	34	227
Service cost					0
Interest cost	11	12	12	10	11	2
Settlement					(10)
Actuarial loss				16	35	2
Benefits paid				(16)	(10)	(4)
Projected benefit obligation at December 31				193	253	34	227
Overfunded projected benefit obligation recognized in the Consolidated Balance Sheet as an asset				4
Unfunded projected benefit obligation recognized in the Consolidated Balance Sheet as a liability					$ (72)	$ (34)