Share-Based Compensation - Narrative (Detail) shares in Millions, $ in Millions	9 Months Ended
Sep. 30, 2021 USD ($) shares
Performance based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award grants in period (in shares) \| shares	1.1
Aggregate grant date fair value of stock-based compensation arrangement \| $	$ 29
Share-based awards vesting period	3 years
Time-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award grants in period (in shares) \| shares	0.7
Aggregate grant date fair value of stock-based compensation arrangement \| $	$ 18
Share-based awards vesting period	3 years
Time-based stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award grants in period (in shares) \| shares	2.4
Aggregate grant date fair value of stock-based compensation arrangement \| $	$ 14
Share-based awards vesting period	3 years

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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.

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