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Summary of Significant Accounting Policies - Reclassification of Prior Year Presentation (Details) - USD ($) $ in Millions | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 24, 2022 | Dec. 31, 2022 | Dec. 31, 2024 | Dec. 31, 2023
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Available-for-sale fixed maturity securities, at fair value |  |  | $ 47,292 | $ 12,877
Market risk benefit asset |  |  | 856 | 34
Intangible assets |  |  | 1,545 | 44
Other assets |  |  | 2,745 | 541
Net investment income | $ 513 | $ 700 | 3,628 | 1,388
Investment related losses | (7) | (39) | (346) | (1)
Net gains (losses) on equity securities | (13) | 49 | (48) | 97
Policyholder benefits and claims incurred | (831) | (1,190) | (5,361) | (3,289)
Interest credited to policyholders' account balances |  | (90) | (2,470) | (502)
Interest sensitive contract benefits | (150) | (217) | (1,745) | (480)
Amortization of deferred policy acquisition costs, deferred sales inducements, and value of business acquired | (227) | (319) | (939) | (525)
Change in fair value of insurance-related derivatives and embedded derivatives | (31) | 23 | 94 | (36)
Operating expenses | (258) | (322) | (880) | (601)
Interest expense | 0 | (42) | (165) | (99)
Private loans |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Private loans |  |  | $ 5,732 | 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 | 385 | 663 |  | 1,501
Investment related losses | 0 | 0 |  | 0
Net realized investment gains (losses) | 21 | (23) |  | (73)
Increase in investment credit loss | (15) | (65) |  | (27)
Net gains (losses) on equity securities | (13) | 49 |  | 97
Policyholder benefits and claims incurred |  | (1,188) |  | (3,261)
Interest credited to policyholders' account balances | (53) | (156) |  | (628)
Interest sensitive contract benefits | 0 | 0 |  | 0
Amortization of deferred policy acquisition costs, deferred sales inducements, and value of business acquired |  | (322) |  | (521)
Change in fair value of insurance-related derivatives and embedded derivatives | 0 | 0 |  | 0
Future policy benefit remeasurement losses |  | (2) |  | (28)
Other operating expenses | (256) | (366) |  | (712)
Operating expenses | 0 | 0 |  | 0
Interest expense |  | 0 |  | 0
Other components of net periodic pension benefit (costs), net of tax | (2) | 4 |  | 9
Net income (loss) after reclassification adjustments | 67 | (1,406) |  | (3,643)
American National, Historical | Private loans |  |  |  |
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 | 128 | 37 |  | (113)
Investment related losses | (7) | (39) |  | (1)
Net realized investment gains (losses) | (21) | 23 |  | 73
Increase in investment credit loss | 15 | 65 |  | 27
Net gains (losses) on equity securities | 13 | (49) |  | (97)
Policyholder benefits and claims incurred |  | (2) |  | (28)
Interest credited to policyholders' account balances | 53 | 156 |  | 628
Interest sensitive contract benefits | (150) | (217) |  | (480)
Amortization of deferred policy acquisition costs, deferred sales inducements, and value of business acquired |  | 3 |  | (4)
Change in fair value of insurance-related derivatives and embedded derivatives | (31) | 23 |  | (36)
Future policy benefit remeasurement losses |  | 2 |  | 28
Other operating expenses | 256 | 366 |  | 712
Operating expenses | (258) | (322) |  | (601)
Interest expense |  | (42) |  | (99)
Other components of net periodic pension benefit (costs), net of tax | 2 | (4) |  | (9)
Net income (loss) after reclassification adjustments | 0 | 0 |  | 0
Reclassification to Conform Presentation | Private loans |  |  |  |
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 | 513 | 700 |  | 1,388
Investment related losses | (7) | (39) |  | (1)
Net realized investment gains (losses) | 0 | 0 |  | 0
Increase in investment credit loss | 0 | 0 |  | 0
Net gains (losses) on equity securities | 0 | 0 |  | 0
Policyholder benefits and claims incurred |  | (1,190) |  | (3,289)
Interest credited to policyholders' account balances | 0 | 0 |  | 0
Interest sensitive contract benefits | (150) | (217) |  | (480)
Amortization of deferred policy acquisition costs, deferred sales inducements, and value of business acquired |  | (319) |  | (525)
Change in fair value of insurance-related derivatives and embedded derivatives | (31) | 23 |  | (36)
Future policy benefit remeasurement losses |  | 0 |  | 0
Other operating expenses | 0 | 0 |  | 0
Operating expenses | (258) | (322) |  | (601)
Interest expense |  | (42) |  | (99)
Other components of net periodic pension benefit (costs), net of tax | 0 | 0 |  | 0
Net income (loss) after reclassification adjustments | $ 67 | $ (1,406) |  | (3,643)
American National, Conformed | Private loans |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Private loans |  |  |  | $ 194

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