Indebtedness (Narrative) (Details) $ in Millions			12 Months Ended
	Jan. 31, 2020 USD ($)	Jan. 28, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Indebtedness [Line Items]
Committed credit facilities, maximum borrowing capacity			$ 8,000
Ratio of consolidated EBITDA to consolidated interest expense on a rolling 4 quarter basis, minimum (not less than)			3.5
Ratio of consolidated EBITDA to consolidated interest expense on a rolling 4 quarter basis			11.2
Amount Outstanding			$ 338	$ 730
Bank Loans [Member]
Indebtedness [Line Items]
Amount Outstanding			338	730
Subsidiaries [Member] | Bank Loans [Member]
Indebtedness [Line Items]
Amount Outstanding			338	730
Short-term credit arrangement [Member] | Subsidiaries [Member]
Indebtedness [Line Items]
Committed credit facilities, maximum borrowing capacity			2,700	$ 3,300
364-day revolving credit, expiring February 4, 2020 [Member]
Indebtedness [Line Items]
Committed credit facilities, maximum borrowing capacity		$ 2,000	$ 2,000
Debt term		364 days
354-day revolving credit, expiring February 2, 2021 [Member] | Subsequent Event [Member]
Indebtedness [Line Items]
Committed credit facilities, maximum borrowing capacity	$ 2,000
Debt term	364 days