Self-Insurance Reserve for Losses and Loss Adjustment Expenses (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 30, 2011	Dec. 31, 2010
Other Liabilities [Line Items]
Balance at beginning of year	$ 313	$ 304
Less: reinsurance recoverable	(7)	(9)
Net balance at beginning of year	306	295
Incurred related to:
Current year	117	114
Prior year	(9)	(8)
Total incurred	108	106
Paid related to:
Current year	(32)	(38)
Prior year	(57)	(57)
Total paid	(89)	(95)
Net balance at end of year	325	306
Add: reinsurance recoverable	5	7
Balance at end of year	$ 330	$ 313