Retirement Benefit Plans (Level 3 Investment Assets) (Details) $ in Millions |
12 Months Ended | |
|---|---|---|
|
Feb. 02, 2019
USD ($)
manager
|
Feb. 03, 2018
USD ($)
|
|
| 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 | $ 10 | $ 7 |
| Realized gains | (7) | |
| Unrealized gains/(losses) | 6 | |
| Purchases and issuances | 0 | 6 |
| Sales, maturities and settlements | (6) | (2) |
| Balance, end of year | 4 | 10 |
| Corporate loans [Member] | ||
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||
| Balance, beginning of year | 4 | 0 |
| Realized gains | 0 | |
| Unrealized gains/(losses) | 0 | |
| Purchases and issuances | 3 | 4 |
| Sales, maturities and settlements | (1) | 0 |
| Balance, end of year | $ 6 | $ 4 |