Repurchase of Common Stock (Schedule of share repurchases) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
Jul. 31, 2021	Jul. 31, 2021	Aug. 01, 2020
Shareholders' Equity [Abstract]
Total cost of shares repurchased	$ 416	$ 1,331	$ 56
Average price per share	$ 112.75	$ 109.92	$ 86.30
Number of shares repurchased	3.7	12.1	0.6

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration