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Summary of Significant Accounting Policies (Gross Carrying Amount and Accumulated Amortization of Intangible Assets) (Details) $ in Millions	Jan. 31, 2021 USD ($)
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (169)
Total Intangible Assets	3,781
Trade Names
Indefinite-lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	649
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,965
Accumulated Amortization	(157)
Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	151
Accumulated Amortization	(1)
Other Finite-Lived Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	16
Accumulated Amortization	$ (11)

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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