Stockholders' Equity - Summary of Other Equity Reserves and Subordinated Notes (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Reserves Within Equity And Subordinated Notes [Abstract]
Other equity reserves	$ (2,365)	$ (2,453)
Subordinated liabilities	994	0
Total Other Equity Reserves And Subordinated Notes	$ (1,371)	$ (2,453)

Disclosure of reserves within equity and subordinated notes.

No definition available.

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- Definition

Total other equity reserves and subordinated notes.

+ References

No definition available.

+ Details

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- Definition

A component of equity representing reserves within equity, not including retained earnings. [Refer: Retained earnings]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition

The amount of liabilities that are subordinate to other liabilities with respect to claims.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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