| Component: (Network and Table) | |
|---|---|
| Network | 2401406 - Disclosure - Summary Of Significant Accounting Policies (Other Assets) (Detail) (http://www.costco.com/role/SummaryOfSignificantAccountingPoliciesOtherAssetsDetail) |
| Table | Other Assets [Table] |
| Reporting Entity [Axis] | 0000909832 (http://www.sec.gov/CIK) |
| Legal Entity [Axis] | Entity [Domain] |
| Other Assets [Line Items] | Period [Axis] | |
|---|---|---|
2013-09-01 | 2012-09-02 | |
Summary Of Significant Accounting Policies | ||
Prepaid rents, lease costs, and long-term deposits | 236,000,000 | 230,000,000 |
Receivables from governmental entities | 128,000,000 | 225,000,000 |
Cash surrender value of life insurance | 74,000,000 | 76,000,000 |
Goodwill, net | 63,000,000 | 66,000,000 |
Other | 61,000,000 | 56,000,000 |
Other Assets | 562,000,000 | 653,000,000 |