Postretirement Health Care and Life Insurance Benefits Postretirement Health Care and Life Insurance Benefits (Estimated Postretirement Benefit Payments in Future Years) (Details) - Other Postretirement Benefits Plan [Member] $ in Millions	Jan. 30, 2021 USD ($)
Expected Benefit [Abstract]
2021	$ 13
2022	12
2023	11
2024	10
2025	9
2026-2030	$ 36