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Revenue Recognition Change in Contract with Customer (Details) $ in Millions | 9 Months Ended
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Nov. 03, 2018 USD ($)
Revenue from Contract with Customer [Abstract] |  |
Contract with Customer, Liability, Revenue recognized | $ 729 |
Contract with Customer, Liability, Increase (decrease) due to acquisition | 14 | [1]
Contract with Customer, Liability, Revenue adjustments | $ 2 | [2]
[1] | (1)Represents an increase in our contract liability balances due to our acquisition of GreatCall, primarily related to deferred revenue.
[2] | (2)Includes changes in the measure of progress, changes in the estimate of the transaction price or contract modifications.

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- Definition Amount of revenue recognized related to changes in the measure of progress, changes in the estimate of the transaction price or contract modifications. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration