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Future Policy Benefits - Summary of Liability for Future Policy Benefit Activity (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Present value of expected future policy benefits: |  |  |
Net liability for future policy benefits |  | $ 53,774 | $ 57,655
Long-term Care Insurance |  |  |
Present value of expected net premiums: |  |  |
Beginning balance |  | 18,650 | 19,895
Beginning balance, at original discount rate |  | 18,346 | 19,959
Effect of changes in cash flow assumptions |  | 31 | (276)
Effect of actual variances from expected experience |  | (251) | (365)
Adjusted beginning balance |  | 18,126 | 19,318
Issuances |  | 0 | 2
Interest accretion |  | 463 | 994
Net premiums collected | [1] | (916) | (1,968)
Derecognition (lapses and withdrawals) |  | 0 | 0
Other |  | 0 | 0
Ending balance, at original discount rate |  | 17,673 | 18,346
Effect of changes in discount rate assumptions |  | (280) | 304
Ending balance |  | 17,393 | 18,650
Present value of expected future policy benefits: |  |  |
Beginning balance |  | 62,579 | 61,352
Beginning balance, at original discount rate |  | 60,513 | 61,148
Effect of changes in cash flow assumptions |  | (55) | (292)
Effect of actual variances from expected experience |  | (203) | (50)
Adjusted beginning balance |  | 60,255 | 60,806
Issuances |  | 0 | 2
Interest accretion |  | 1,641 | 3,327
Benefit payments |  | (1,984) | (3,621)
Derecognition (lapses and withdrawals) |  | 0 | 0
Other |  | 0 | (1)
Ending balance, at original discount rate |  | 59,912 | 60,513
Effect of changes in discount rate assumptions |  | (1,495) | 2,066
Ending balance |  | 58,417 | 62,579
Net liability for future policy benefits, before flooring adjustments |  | 41,024 | 43,929
Flooring adjustments | [2] | 0 | 0
Net liability for future policy benefits |  | 41,024 | 43,929
Less: reinsurance recoverable |  | 6,994 | 7,572
Net liability for future policy benefits, net of reinsurance recoverable |  | $ 34,030 | $ 36,357
Weighted-average liability duration (years) |  | 13 years | 13 years 8 months 12 days
Life Insurance |  |  |
Present value of expected net premiums: |  |  |
Beginning balance |  | $ 4,180 | $ 4,083
Beginning balance, at original discount rate |  | 3,918 | 3,922
Effect of changes in cash flow assumptions |  | 0 | 180
Effect of actual variances from expected experience |  | (15) | 38
Adjusted beginning balance |  | 3,903 | 4,140
Issuances |  | 0 | 0
Interest accretion |  | 108 | 217
Net premiums collected | [1] | (226) | (439)
Derecognition (lapses and withdrawals) |  | 0 | 0
Other |  | 1 | 0
Ending balance, at original discount rate |  | 3,786 | 3,918
Effect of changes in discount rate assumptions |  | 74 | 262
Ending balance |  | 3,860 | 4,180
Present value of expected future policy benefits: |  |  |
Beginning balance |  | 5,412 | 5,556
Beginning balance, at original discount rate |  | 5,146 | 5,374
Effect of changes in cash flow assumptions |  | 0 | 261
Effect of actual variances from expected experience |  | (3) | 61
Adjusted beginning balance |  | 5,143 | 5,696
Issuances |  | 0 | 0
Interest accretion |  | 137 | 281
Benefit payments |  | (409) | (823)
Derecognition (lapses and withdrawals) |  | 0 | 0
Other |  | 0 | (8)
Ending balance, at original discount rate |  | 4,871 | 5,146
Effect of changes in discount rate assumptions |  | 104 | 266
Ending balance |  | 4,975 | 5,412
Net liability for future policy benefits, before flooring adjustments |  | 1,115 | 1,232
Flooring adjustments | [2] | 470 | 466
Net liability for future policy benefits |  | 1,585 | 1,698
Less: reinsurance recoverable |  | 818 | 852
Net liability for future policy benefits, net of reinsurance recoverable |  | $ 767 | $ 846
Weighted-average liability duration (years) |  | 5 years 8 months 12 days | 5 years 10 months 24 days
Fixed annuities |  |  |
Present value of expected net premiums: |  |  |
Beginning balance |  | $ 0 | $ 0
Beginning balance, at original discount rate |  | 0 | 0
Effect of changes in cash flow assumptions |  | 0 | 0
Effect of actual variances from expected experience |  | 0 | 0
Adjusted beginning balance |  | 0 | 0
Issuances |  | 20 | 42
Interest accretion |  | 0 | 0
Net premiums collected | [1] | (20) | (42)
Derecognition (lapses and withdrawals) |  | 0 | 0
Other |  | 0 | 0
Ending balance, at original discount rate |  | 0 | 0
Effect of changes in discount rate assumptions |  | 0 | 0
Ending balance |  | 0 | 0
Present value of expected future policy benefits: |  |  |
Beginning balance |  | 11,829 | 11,923
Beginning balance, at original discount rate |  | 9,920 | 10,300
Effect of changes in cash flow assumptions |  | 0 | (33)
Effect of actual variances from expected experience |  | (42) | (30)
Adjusted beginning balance |  | 9,878 | 10,237
Issuances |  | 16 | 35
Interest accretion |  | 322 | 663
Benefit payments |  | (490) | (1,016)
Derecognition (lapses and withdrawals) |  | 0 | 0
Other |  | 5 | 1
Ending balance, at original discount rate |  | 9,731 | 9,920
Effect of changes in discount rate assumptions |  | 1,241 | 1,909
Ending balance |  | 10,972 | 11,829
Net liability for future policy benefits, before flooring adjustments |  | 10,972 | 11,829
Flooring adjustments | [2] | 0 | 0
Net liability for future policy benefits |  | 10,972 | 11,829
Less: reinsurance recoverable |  | 8,365 | 9,008
Net liability for future policy benefits, net of reinsurance recoverable |  | $ 2,607 | $ 2,821
Weighted-average liability duration (years) |  | 10 years 3 months 18 days | 11 years 1 month 6 days
[1] | Represents the portion of gross premiums collected from policyholders that is used to fund expected benefit payments.
[2] | Flooring adjustments are necessary when a cohort’s present value of future net premiums exceeds the present value of future benefits. The flooring adjustment ensures that the liability for future policy benefits for each cohort is not less than zero. This adjustment is most prevalent in our term life insurance products due to their product design of a level premium period followed by annual premium rate increases.

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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- Definition Amount of cumulative increase (decrease) in expected future policy benefit and expense component for liability of future policy benefit from cash flow assumption change for future cash flows. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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- Definition Amount of decrease in expected future policy benefit and expense component of liability for future policy benefit from derecognition of contract. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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- Definition Amount of increase in expected future policy benefit and expense component of liability for future policy benefit from contract issuance. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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