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Statutory Restrictions on Investments and Stockholders' Equity (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statutory Accounting Practices [Line Items]
Investments on deposit with state treasurers	$ 102	$ 108
Dividends available to parent from subsidiaries	689
Loans and advances available to parent from subsidiaries	113
Differences in state prescribed or permitted practices to NAIC Statutory Accounting	325	293
FATICO
Statutory Accounting Practices [Line Items]
Statutory surplus maintained by insurance subsidiary	1,500	1,700
Statutory net income of insurance subsidiary	$ 436	$ 654	$ 502

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- Definition

Statutory accounting practices statutory amount available for loans and advances without regulatory approval.

+ References

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- Definition

Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 825
-Section 50
-Paragraph 1A
-URI https://asc.fasb.org/extlink&oid=123600598&loc=SL75763979-209797

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- Definition

Amount of an item which resulted in a difference from applying state prescribed or permitted statutory accounting practices rather than statutory accounting practices prescribed by National Association of Insurance Commissioners.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 3
-Subparagraph (b)
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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.

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- Definition

Amount of dividends that can be declared or paid without approval of regulatory agency.

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- Definition

The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators.

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-Name Accounting Standards Codification
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