| Defined Benefit Plans [Domain] |
Nonqualified Plans, Including Postretirement Health Care Benefits [Member] |
Other Postretirement Benefit Plans, Defined Benefit [Member] |
2006-01-29 - 2007-02-03 |
Defined Benefit Plan Disclosure [Line Items] | Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract] | |
| Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components | 0 |
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components | 0 |
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation | 9,000,000 |
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation | (8,000,000) |