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Summary of Significant Accounting Policies - Reclassification of Prior Year Presentation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Available-for-sale fixed maturity securities, at fair value | $ 46,480 |  | $ 46,480 |  | $ 12,877
Market risk benefit asset | 704 |  | 704 |  | 34
Intangible assets | 1,612 |  | 1,612 |  | 44
Other assets | 2,055 |  | 2,055 |  | 541
Net investment income | 924 | $ 342 | 1,372 | $ 666 |
Investment related gains (losses) | 2 | 41 | (32) | (20) |
Net gains (losses) on equity securities | 35 | 71 | 24 | 43 |
Policyholder benefits and claims incurred | (1,030) | (989) | (2,116) | (1,689) |
Interest sensitive contract benefits | 390 | 116 | 545 | 205 |
Amortization of deferred policy acquisition costs, deferred sales inducements and value of business acquired | 199 | 132 | 360 | 263 |
Change in fair value of insurance-related derivatives and embedded derivatives | 21 | (26) | 2 | 0 |
Change in fair value of market risk benefits | 139 | (12) | 158 | (7) |
Operating expenses | 335 | 148 | 438 | 303 |
Interest expense | 43 | 22 | 65 | 46 |
Change in deferred policy acquisition |  |  | 483 | 401 |
Private Loan |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Private loans | $ 1,724 |  | $ 1,724 |  | 194
American National, Historical |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Available-for-sale fixed maturity securities, at fair value |  |  |  |  | 13,071
Market risk benefit asset |  |  |  |  | 34
Current tax receivable |  |  |  |  | 98
Prepaid pension |  |  |  |  | 248
Intangible assets |  |  |  |  | 0
Other assets |  |  |  |  | 205
Liability for retirement benefits |  |  |  |  | 26
Other liabilities |  |  |  |  | 441
Net assets after reclassification adjustments |  |  |  |  | 14,123
Net investment income |  | 382 |  | 723 |
Investment related gains (losses) |  | 0 |  | 0 |
Net realized investment gains (losses) |  | (28) |  | (50) |
Increase in investment credit loss |  | (2) |  | (13) |
Net gains (losses) on equity securities |  | 71 |  | 43 |
Other income |  | 13 |  | 21 |
Policyholder benefits and claims incurred |  | (972) |  | (1,691) |
Interest credited to policyholder account balances |  | (136) |  | (276) |
Interest sensitive contract benefits |  | 0 |  | 0 |
Amortization of deferred policy acquisition costs, deferred sales inducements and value of business acquired |  | 0 |  | 0 |
Change in fair value of insurance-related derivatives and embedded derivatives |  | 0 |  | 0 |
Change in fair value of market risk benefits |  | (5) |  | 8 |
Future policy benefit remeasurement losses |  |  |  | 1 |
Amortization of deferred policy acquisition costs, deferred sales inducements and value of business acquired |  | (214) |  | (393) |
Operating expenses |  | (191) |  | (369) |
Operating expenses |  | 0 |  | 0 |
Interest expense |  | 0 |  | 0 |
Change in deferred policy acquisition |  | 94 |  | 142 |
Net periodic benefit cost |  | 2 |  | 1 |
Net income (loss) after reclassification adjustments |  | (986) |  | (1,853) |
American National, Historical | Private Loan |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Private loans |  |  |  |  | 0
Reclassification to Conform Presentation |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Available-for-sale fixed maturity securities, at fair value |  |  |  |  | (194)
Market risk benefit asset |  |  |  |  | (34)
Current tax receivable |  |  |  |  | (98)
Prepaid pension |  |  |  |  | (248)
Intangible assets |  |  |  |  | 44
Other assets |  |  |  |  | 336
Liability for retirement benefits |  |  |  |  | (26)
Other liabilities |  |  |  |  | 26
Net assets after reclassification adjustments |  |  |  |  | 0
Net investment income |  | (40) |  | (57) |
Investment related gains (losses) |  | 41 |  | (20) |
Net realized investment gains (losses) |  | 28 |  | 50 |
Increase in investment credit loss |  | 2 |  | 13 |
Net gains (losses) on equity securities |  | (71) |  | (43) |
Other income |  | (13) |  | (21) |
Policyholder benefits and claims incurred |  | (17) |  | 2 |
Interest credited to policyholder account balances |  | 136 |  | 276 |
Interest sensitive contract benefits |  | (116) |  | (205) |
Amortization of deferred policy acquisition costs, deferred sales inducements and value of business acquired |  | (132) |  | (263) |
Change in fair value of insurance-related derivatives and embedded derivatives |  | 26 |  | 0 |
Change in fair value of market risk benefits |  | 17 |  | (1) |
Future policy benefit remeasurement losses |  |  |  | (1) |
Amortization of deferred policy acquisition costs, deferred sales inducements and value of business acquired |  | 214 |  | 393 |
Operating expenses |  | 191 |  | 369 |
Operating expenses |  | (148) |  | (303) |
Interest expense |  | (22) |  | (46) |
Change in deferred policy acquisition |  | (94) |  | (142) |
Net periodic benefit cost |  | (2) |  | (1) |
Net income (loss) after reclassification adjustments |  | 0 |  | 0 |
Reclassification to Conform Presentation | Private Loan |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Private loans |  |  |  |  | 194
American National, Conformed |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Available-for-sale fixed maturity securities, at fair value |  |  |  |  | 12,877
Market risk benefit asset |  |  |  |  | 0
Current tax receivable |  |  |  |  | 0
Prepaid pension |  |  |  |  | 0
Intangible assets |  |  |  |  | 44
Other assets |  |  |  |  | 541
Liability for retirement benefits |  |  |  |  | 0
Other liabilities |  |  |  |  | 467
Net assets after reclassification adjustments |  |  |  |  | 14,123
Net investment income |  | 342 |  | 666 |
Investment related gains (losses) |  | 41 |  | (20) |
Net realized investment gains (losses) |  | 0 |  | 0 |
Increase in investment credit loss |  | 0 |  | 0 |
Net gains (losses) on equity securities |  | 0 |  | 0 |
Other income |  | 0 |  | 0 |
Policyholder benefits and claims incurred |  | (989) |  | (1,689) |
Interest credited to policyholder account balances |  | 0 |  | 0 |
Interest sensitive contract benefits |  | (116) |  | (205) |
Amortization of deferred policy acquisition costs, deferred sales inducements and value of business acquired |  | (132) |  | (263) |
Change in fair value of insurance-related derivatives and embedded derivatives |  | 26 |  | 0 |
Change in fair value of market risk benefits |  | 12 |  | 7 |
Future policy benefit remeasurement losses |  |  |  | 0 |
Amortization of deferred policy acquisition costs, deferred sales inducements and value of business acquired |  | 0 |  | 0 |
Operating expenses |  | 0 |  | 0 |
Operating expenses |  | (148) |  | (303) |
Interest expense |  | (22) |  | (46) |
Change in deferred policy acquisition |  | 0 |  | 0 |
Net periodic benefit cost |  | 0 |  | 0 |
Net income (loss) after reclassification adjustments |  | $ (986) |  | $ (1,853) |
American National, Conformed | Private Loan |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Private loans |  |  |  |  | $ 194

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