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Income Taxes - Unrecognized Tax Benefits Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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Jan. 31, 2023 | Jan. 31, 2022 | Jan. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Gross unrecognized tax benefits at the beginning of the fiscal year | $ 207 | $ 198 | $ 221
Increases for tax positions of prior years | 8 | 9 | 13
Decreases for tax positions of prior years | (3) | (7) | (41)
Increases for tax positions related to the current year | 17 | 7 | 6
Decreases relating to settlements with taxing authorities | (5) | 0 | 0
Reductions as a result of lapse of the statute of limitations | (1) | 0 | (1)
Gross unrecognized tax benefits at the end of the fiscal year | $ 223 | $ 207 | $ 198

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI https://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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