Self-Insurance Reserve for Losses and Loss Adjustment Expenses - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 28, 2012
Self-Insurance Reserve for Losses and Loss Adjustment Expenses Disclosure [Abstract]
Increase (decrease) in provision for unpaid loss and loss adjustment expenses, current year		$ 10
Increase (decrease) in provision for unpaid loss and loss adjustment expenses, prior years	(2)	8
Self-insurance reserve	384	362	342
Self-insurance reserve, current portion	120	120
Self-insurance reserve, long-term portion	$ 264	$ 242

Liability for Unpaid Claims and Claims Adjustment Expense, Gross, Current

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- Definition

Liability for Unpaid Claims and Claims Adjustment Expense, Gross, Noncurrent

+ References

No definition available.

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- Definition

Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease), Current Year

+ References

No definition available.

+ Details

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- Definition

The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 50

-Paragraph 3

-Subparagraph (a),(b),(c)

-URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437

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- Definition

Amount of expense for claims incurred in prior reporting periods and related claims settlement costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 235

-Section S99

-Paragraph 3

-Subparagraph (SX 210.12-18)

-URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 18

-Article 12

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