Retirement Benefit Plans (Level 3 Investment Assets) (Details) $ in Millions |
12 Months Ended | |
|---|---|---|
|
Feb. 01, 2020
USD ($)
manager
|
Feb. 02, 2019
USD ($)
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||
| Number of hedge fund managers (more than) | manager | 30 | |
| Corporate bonds [Member] | ||
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||
| Balance, beginning of year | $ 4 | $ 10 |
| Purchases and issuances | 0 | 0 |
| Sales, maturities and settlements | 0 | (6) |
| Balance, end of year | 4 | 4 |
| Corporate loans [Member] | ||
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||
| Balance, beginning of year | 6 | 4 |
| Purchases and issuances | 0 | 3 |
| Sales, maturities and settlements | 0 | (1) |
| Balance, end of year | $ 6 | $ 6 |