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Liabilities Measured at Fair Value on Recurring Basis and Utilized Significant Unobservable (Level 3) Inputs to Determine Fair Value (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | $ 191 | $ 199 | $ 189 | $ 217
Total realized and unrealized (gains) losses included in net (income) | 10 | 9 | 18 | 6
Total realized and unrealized (gains) losses included in OCI | 13 | 0 | 13 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Issuances | 3 | 2 | 7 | 7
Settlements | (8) | (11) | (17) | (30)
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | (1) | (1) | (2)
Ending balance | 209 | 198 | 209 | 198
Total (gains) losses included in net (income) attributable to liabilities still held | 10 | 6 | 18 | 3
Total (gains) losses included in OCI attributable to liabilities still held | 13 | 0 | 13 | 0
Derivative liabilities |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 13 | 0 | 9 | 0
Total realized and unrealized (gains) losses included in net (income) | 7 | 3 | 11 | 3
Total realized and unrealized (gains) losses included in OCI | 13 | 0 | 13 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | 0
Ending balance | 33 | 3 | 33 | 3
Total (gains) losses included in net (income) attributable to liabilities still held | 7 | 0 | 11 | 0
Total (gains) losses included in OCI attributable to liabilities still held | 13 | 0 | 13 | 0
Forward bond purchase commitments | Derivative liabilities |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 13 | 0 | 9 | 0
Total realized and unrealized (gains) losses included in net (income) | 7 | 3 | 11 | 3
Total realized and unrealized (gains) losses included in OCI | 13 | 0 | 13 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | 0
Ending balance | 33 | 3 | 33 | 3
Total (gains) losses included in net (income) attributable to liabilities still held | 7 | 0 | 11 | 0
Total (gains) losses included in OCI attributable to liabilities still held | 13 | 0 | 13 | 0
Policyholder account balances |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 178 | 199 | 180 | 217
Total realized and unrealized (gains) losses included in net (income) | 3 | 6 | 7 | 3
Total realized and unrealized (gains) losses included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Issuances | 3 | 2 | 7 | 7
Settlements | (8) | (11) | (17) | (30)
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | (1) | (1) | (2)
Ending balance | 176 | 195 | 176 | 195
Total (gains) losses included in net (income) attributable to liabilities still held | 3 | 6 | 7 | 3
Total (gains) losses included in OCI attributable to liabilities still held | 0 | 0 | 0 | 0
Policyholder account balances | Fixed indexed annuity embedded derivatives |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 163 | 184 | 165 | 202
Total realized and unrealized (gains) losses included in net (income) | 5 | 8 | 13 | 10
Total realized and unrealized (gains) losses included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Settlements | (8) | (11) | (17) | (30)
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | (1) | (1) | (2)
Ending balance | 160 | 180 | 160 | 180
Total (gains) losses included in net (income) attributable to liabilities still held | 5 | 8 | 13 | 10
Total (gains) losses included in OCI attributable to liabilities still held | 0 | 0 | 0 | 0
Policyholder account balances | Indexed universal life embedded derivatives |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 15 | 15 | 15 | 15
Total realized and unrealized (gains) losses included in net (income) | (2) | (2) | (6) | (7)
Total realized and unrealized (gains) losses included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Issuances | 3 | 2 | 7 | 7
Settlements | 0 | 0 | 0 | 0
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | 0
Ending balance | 16 | 15 | 16 | 15
Total (gains) losses included in net (income) attributable to liabilities still held | (2) | (2) | (6) | (7)
Total (gains) losses included in OCI attributable to liabilities still held | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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