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Stock-based Compensation Plans - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Intrinsic value of stock options outstanding | $ 0 |  |  |
Intrinsic value of stock options exercisable | 0 |  |  |
Total intrinsic value of options exercised | 0 | $ 4,000,000 | $ 15,000,000 |
Total unrecognized compensation cost related to nonvested stock-based compensation arrangements | 335,000,000 |  |  |
Expected to be recognized in 2021 | 198,000,000 |  |  |
Expected to be recognized in 2022 | 102,000,000 |  |  |
Expected to be recognized in 2023 | 26,000,000 |  |  |
Expected to be recognized in 2024 | $ 9,000,000 |  |  |
Future Grants Shares | 16,000,000 |  |  |
Employee Stock Option |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock option maximum term | 10 years |  |  |
Stock options vesting period | over five years |  |  |
Weighted-average remaining contractual life of stock options exercisable, in years | 3 years 3 months 18 days |  |  |
Performance Shares |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Performance shares outstanding | 3,800,000 |  |  |
Performance Shares | Achievement Exceeds Predefined Target | Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Performance shares to be awarded as a percentage of total target award | 250.00% |  |  |
Performance Shares | Achievement Falls Below Threshold |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Performance shares to be awarded | 0 |  |  |
Restricted Stock |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Performance shares to be awarded | 10,637,000 | 7,888,000 | 3,204,000 |
Performance shares outstanding | 18,763,000 | 11,822,000 | 6,951,000 | 5,428,000
Restricted stock awards, vesting period | 3 years |  |  |
DSPP |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Percentage purchase price of stock lower of stock price at beginning or end of plan period at specified intervals | 92.50% |  |  |

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- Definition Employee service share based compensation unrecognized compensation costs on nonvested awards expected to be recognized in year one. + References No definition available. + Details
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- Definition Employee service share based compensation unrecognized compensation costs on nonvested awards expected to be recognized in year three. + References No definition available. + Details
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- Definition Employee service share based compensation unrecognized compensation costs on nonvested awards expected to be recognized in year two. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award award vesting periods. + References No definition available. + Details
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- Definition 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. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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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