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Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2020 | Nov. 02, 2019 | Oct. 31, 2020 | Nov. 02, 2019
Retirement Benefits Disclosure [Line Items] |  |  |  |
Expense related to the qualified plan | $ 16 | $ 19 | $ 55 | $ 58
Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit [Member] |  |  |  |
Retirement Benefits Disclosure [Line Items] |  |  |  |
Liability, Other Retirement Benefits | 258 |  | 258 |
Expense related to non-qualified plan | $ 3 | $ 8 | $ 11 | $ 20

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- Definition Amount of current liability, recognized in statement of financial position, for non-qualified retirement plan obligations. + References No definition available. + Details
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Namespace Prefix: | lb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Balance Type: | debit
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- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |