Employee Incentive Plans - Additional Information (Detail) shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2021 shares	Dec. 31, 2020 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Post-vesting and delivery transfer restriction through date for RSU and restricted stock awards granted or delivered subsequent to year end		January 2026
Unrecognized compensation costs related to nonvested share-based compensation arrangements \| $		$ 408
Period over which unrecognized compensation costs related to nonvested share-based compensation arrangements will be recognized		1 year 8 months 8 days
Restricted Stock Units (RSUs) [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of final grant adjusted on original grant		0
Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of final grant adjusted on original grant		150
Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted subsequent to year end	9.0
Unvested restricted stock units granted subsequent to year end	3.0
2018 SIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant under the 2018 SIP		55.5

Percentage of final grant adjusted on original grant.

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- Definition

Post-vesting and delivery transfer restriction through date for RSU and restricted stock awards granted or delivered subsequent to year end.

+ References

No definition available.

+ Details

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- Definition

Number of stock granted subsequent to year end as a result of any share-based compensation plan other than en employee stock ownership plan

+ References

No definition available.

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- Definition

Unvested number of stock granted subsequent to year end as a result of any share-based compensation plan other than en employee stock ownership plan.

+ References

No definition available.

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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

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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

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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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- 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

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