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v3.21.2

Restructuring and Other Related Charges (Narrative) (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2021 USD ($) employee
Restructuring Cost and Reserve [Line Items] |
Number of positions eliminated | 120
T21 |
Restructuring Cost and Reserve [Line Items] |
Expected number of positions eliminated | 260
Number of positions eliminated | 255
Expected cost remaining | $ | $ 20

X
- Definition Amount of expected cost remaining for the specified restructuring cost. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The expected number of positions to be eliminated as a result of restructuring activities. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of positions eliminated during the period as a result of restructuring activities. + References No definition available. + Details
Name: | us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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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_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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