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INVESTMENTS - Contractual and Economic Maturities of Investments in Fixed Maturities (Detail) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Available for sale: |  |  |  |
Due in one year or less | [1] | $ 914 |  |
Due after one year through five years | [1] | 8,302 |  |
Due after five years through 10 years | [1] | 13,291 |  |
Due after 10 years | [1] | 63,479 |  |
Mortgage- and asset-backed securities | [1] | 1,242 |  |
Total fixed maturity securities, available for sale, amortized cost | [1] | 87,228 |  |
Held to maturity: |  |  |  |
Due in one year or less | [1] | 0 |  |
Due after one year through five years | [1] | 45 |  |
Due after five years through 10 years | [1] | 8,753 |  |
Due after 10 years | [1] | 13,815 |  |
Mortgage- and asset-backed securities | [1] | 0 |  |
Total fixed maturity securities, held to maturity, amortized cost |  | 22,613 | [1] | $ 24,464
Available for sale: |  |  |  |
Due in one year or less |  | 930 |  |
Due after one year through five years |  | 8,909 |  |
Due after five years through 10 years |  | 15,565 |  |
Due after 10 years |  | 74,026 |  |
Mortgage- and asset-backed securities |  | 1,292 |  |
Total fixed maturity securities, available for sale, fair value |  | 100,722 |  | 105,882
Held to maturity: |  |  |  |
Due in one year or less |  | 0 |  |
Due after one year through five years |  | 49 |  |
Due after five years through 10 years |  | 10,207 |  |
Due after 10 years |  | 17,492 |  |
Mortgage- and asset-backed securities |  | 0 |  |
Total fixed maturity securities, held to maturity, fair value |  | $ 27,748 |  | $ 30,399
[1] | Net of allowance for credit losses

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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant