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Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Rollforward of Reserve for Future Policy Benefits (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Present value of expected net premiums |  |  |  |
Beginning balance | $ 2,013 | $ 1,702 |  |
Beginning balance at original discount rate | 2,067 | 1,795 |  |
Effect of changes in cash flow assumptions |  |  | $ 0 | $ 0
Effect of actual variances from expected experience |  |  | (33) | (37)
Adjusted beginning balance |  |  | 2,034 | 1,758
Issuances | 262 | 216 |  |
Interest accrual | 23 | 15 |  |
Net premiums collected | (114) | (107) |  |
Ending balance at original discount rate | 2,205 | 1,882 |  |
Effect of changes in discount rate assumptions | (90) | (67) |  |
Ending balance | 2,115 | 1,815 |  |
Present value of expected future policy benefits |  |  |  |
Beginning balance | 3,110 | 2,753 |  |
Beginning balance at original discount rate | 3,151 | 2,850 |  |
Effect of changes in cash flow assumptions |  |  | (6) | 0
Effect of actual variances from expected experience |  |  | (39) | (43)
Adjusted beginning balance |  |  | 3,106 | 2,807
Issuances | 263 | 215 |  |
Interest accrual | 34 | 25 |  |
Benefit payments | (114) | (111) |  |
Ending balance at original discount rate | 3,289 | 2,936 |  |
Effect of changes in discount rate assumptions | (108) | (54) |  |
Ending balance | 3,181 | 2,882 |  |
Net reserve for future policy benefits | 1,066 | 1,067 |  |
Less: reinsurance recoverables | 81 | 78 |  |
Net reserve for future policy benefits, after reinsurance recoverables | 985 | 989 |  |
Reserves related to short-duration contracts | 259 | 271 |  |
Accident and health insurance |  |  |  |
Present value of expected net premiums |  |  |  |
Beginning balance | 1,688 | 1,464 |  |
Beginning balance at original discount rate | 1,737 | 1,549 |  |
Effect of changes in cash flow assumptions |  |  | 0 | 0
Effect of actual variances from expected experience |  |  | (44) | (42)
Adjusted beginning balance |  |  | 1,693 | 1,507
Issuances | 230 | 199 |  |
Interest accrual | 18 | 12 |  |
Net premiums collected | (98) | (95) |  |
Ending balance at original discount rate | 1,843 | 1,623 |  |
Effect of changes in discount rate assumptions | (81) | (62) |  |
Ending balance | 1,762 | 1,561 |  |
Present value of expected future policy benefits |  |  |  |
Beginning balance | 2,453 | 2,229 |  |
Beginning balance at original discount rate | 2,495 | 2,316 |  |
Effect of changes in cash flow assumptions |  |  | (6) | 0
Effect of actual variances from expected experience |  |  | (47) | (47)
Adjusted beginning balance |  |  | 2,442 | 2,269
Issuances | 230 | 199 |  |
Interest accrual | 25 | 19 |  |
Benefit payments | (102) | (99) |  |
Ending balance at original discount rate | 2,595 | 2,388 |  |
Effect of changes in discount rate assumptions | (86) | (53) |  |
Ending balance | 2,509 | 2,335 |  |
Net reserve for future policy benefits | 747 | 774 |  |
Less: reinsurance recoverables | 80 | 76 |  |
Net reserve for future policy benefits, after reinsurance recoverables | 667 | 698 |  |
Traditional life |  |  |  |
Present value of expected net premiums |  |  |  |
Beginning balance | 325 | 238 |  |
Beginning balance at original discount rate | 330 | 246 |  |
Effect of changes in cash flow assumptions |  |  | 0 | 0
Effect of actual variances from expected experience |  |  | 11 | 5
Adjusted beginning balance |  |  | 341 | 251
Issuances | 32 | 17 |  |
Interest accrual | 5 | 3 |  |
Net premiums collected | (16) | (12) |  |
Ending balance at original discount rate | 362 | 259 |  |
Effect of changes in discount rate assumptions | (9) | (5) |  |
Ending balance | 353 | 254 |  |
Present value of expected future policy benefits |  |  |  |
Beginning balance | 657 | 524 |  |
Beginning balance at original discount rate | 656 | 534 |  |
Effect of changes in cash flow assumptions |  |  | 0 | 0
Effect of actual variances from expected experience |  |  | 8 | 4
Adjusted beginning balance |  |  | $ 664 | $ 538
Issuances | 33 | 16 |  |
Interest accrual | 9 | 6 |  |
Benefit payments | (12) | (12) |  |
Ending balance at original discount rate | 694 | 548 |  |
Effect of changes in discount rate assumptions | (22) | (1) |  |
Ending balance | 672 | 547 |  |
Net reserve for future policy benefits | 319 | 293 |  |
Less: reinsurance recoverables | 1 | 2 |  |
Net reserve for future policy benefits, after reinsurance recoverables | $ 318 | $ 291 |  |

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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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