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Stock-Based Compensation (Stock Based Compensation Activity) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Number of Shares |  |  |
Balance (in shares) | 816 | 816 |
Weighted Average Grant Date Fair Value |  |  |
Fair value vested in period |  | $ 13 | $ 18
Cost not yet recognized | $ 40 | $ 40 |
Period for recognition | 1 year 4 months 24 days |  |
Time-based RSUs |  |  |
Number of Shares |  |  |
Balance (in shares) |  | 1,070 |
Granted (in shares) | 240 |  |
Vested (in shares) | (459) |  |
Canceled (in shares) | (35) |  |
Outstanding and expected to vest (in shares) | 816 | 816 |
Weighted Average Grant Date Fair Value |  |  |
Balance (in dollars per share) |  | $ 27.47 |
Granted (in dollars per share) | $ 63.12 |  | $ 21.67
Vested (in dollars per share) | 28.78 |  |
Canceled (in dollars per share) | 32.97 |  |
Balance (in dollars per share) | 36.98 | 36.98 |
Outstanding and expected to vest, weighted average grant date fair value (in dollars per share) | $ 36.98 | $ 36.98 |
Outstanding and expected to vest weighted average remaining contractual term (in years) | 1 year 2 months 12 days |  |
Aggregate intrinsic value, outstanding and expected to vest | $ 64 | $ 64 |
Performance-based and market-based RSUs |  |  |
Number of Shares |  |  |
Balance (in shares) |  | 988 |
Granted (in shares) | 236 |  |
Vested (in shares) | 0 |  |
Canceled (in shares) | (316) |  |
Balance (in shares) | 908 | 908 |
Outstanding and expected to vest (in shares) | 563 | 563 |
Weighted Average Grant Date Fair Value |  |  |
Balance (in dollars per share) |  | $ 32.41 |
Granted (in dollars per share) | $ 62.27 |  | $ 21.06
Vested (in dollars per share) | 0 |  |
Canceled (in dollars per share) | 46.59 |  |
Balance (in dollars per share) | 35.23 | 35.23 |
Outstanding and expected to vest, weighted average grant date fair value (in dollars per share) | $ 40.63 | $ 40.63 |
Outstanding and expected to vest weighted average remaining contractual term (in years) | 1 year 9 months 18 days |  |
Outstanding weighted average remaining contractual terms (in years) | 1 year 9 months 18 days |  |
Aggregate intrinsic value outstanding | $ 71 | $ 71 |
Aggregate intrinsic value, outstanding and expected to vest | $ 44 | $ 44 |

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- Definition Number of unvested equity awards for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References No definition available. + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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