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Summary of Significant Accounting Policies - Reclassification of Prior Year Presentation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Available-for-sale fixed maturity securities, at fair value | $ 45,683 |  | $ 45,683 |  | $ 12,877
Market risk benefit asset | 758 |  | 758 |  | 34
Intangible assets | 1,599 |  | 1,599 |  | 44
Other assets | 1,885 |  | 1,885 |  | 541
Net investment income | 1,024 | $ 375 | 2,396 | $ 1,020 |
Investment related gains (losses) | (128) | (12) | (160) | (32) |
Net gains (losses) on equity securities | 23 | (10) | 47 | 33 |
Policyholder benefits and claims incurred | (846) | (717) | (2,962) | (2,406) |
Interest sensitive contract benefits | (523) | (133) | (1,068) | (338) |
Amortization of deferred policy acquisition costs, deferred sales inducements and value of business acquired | (289) | (136) | (649) | (399) |
Change in fair value of insurance-related derivatives and embedded derivatives | (344) | (54) | (346) | (54) |
Change in fair value of market risk benefits | (134) | 14 | (292) | 21 |
Operating expenses | (228) | (147) | (666) | (450) |
Interest expense | (49) | (27) | (114) | (73) |
Deferral of policy acquisition costs |  |  | 856 | 611 |
Private loans |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Private loans | $ 2,725 |  | $ 2,725 |  | 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 |  | 339 |  | 1,062 |
Investment related gains (losses) |  | 0 |  | 0 |
Net realized investment gains (losses) |  | (15) |  | (65) |
Increase in investment credit loss |  | 20 |  | 7 |
Net gains (losses) on equity securities |  | (13) |  | 30 |
Policyholder benefits and claims incurred |  | (713) |  | (2,404) |
Interest credited to policyholder account balances |  | (155) |  | (431) |
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 |  | 14 |  | 22 |
Future policy benefit remeasurement losses |  | (4) |  | (3) |
Commissions for acquiring and servicing policies |  | (197) |  | (590) |
Other operating expenses |  | (187) |  | (556) |
Operating expenses |  | 0 |  | 0 |
Interest expense |  | 0 |  | 0 |
Deferral of policy acquisition costs |  | 72 |  | 214 |
Other components of net periodic pension benefit (costs), net of tax |  | 2 |  | 3 |
Net income (loss) after reclassification adjustments |  | (837) |  | (2,711) |
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 |  | 36 |  | (42) |
Investment related gains (losses) |  | (12) |  | (32) |
Net realized investment gains (losses) |  | 15 |  | 65 |
Increase in investment credit loss |  | (20) |  | (7) |
Net gains (losses) on equity securities |  | 13 |  | (30) |
Policyholder benefits and claims incurred |  | (4) |  | (2) |
Interest credited to policyholder account balances |  | 155 |  | 431 |
Interest sensitive contract benefits |  | (133) |  | (338) |
Amortization of deferred policy acquisition costs, deferred sales inducements and value of business acquired |  | (136) |  | (399) |
Change in fair value of insurance-related derivatives and embedded derivatives |  | (54) |  | (54) |
Change in fair value of market risk benefits |  | 0 |  | (1) |
Future policy benefit remeasurement losses |  | 4 |  | 3 |
Commissions for acquiring and servicing policies |  | 197 |  | 590 |
Other operating expenses |  | 187 |  | 556 |
Operating expenses |  | (147) |  | (450) |
Interest expense |  | (27) |  | (73) |
Deferral of policy acquisition costs |  | (72) |  | (214) |
Other components of net periodic pension benefit (costs), net of tax |  | (2) |  | (3) |
Net income (loss) after reclassification adjustments |  | 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 |  | 375 |  | 1,020 |
Investment related gains (losses) |  | (12) |  | (32) |
Net realized investment gains (losses) |  | 0 |  | 0 |
Increase in investment credit loss |  | 0 |  | 0 |
Net gains (losses) on equity securities |  | 0 |  | 0 |
Policyholder benefits and claims incurred |  | (717) |  | (2,406) |
Interest credited to policyholder account balances |  | 0 |  | 0 |
Interest sensitive contract benefits |  | (133) |  | (338) |
Amortization of deferred policy acquisition costs, deferred sales inducements and value of business acquired |  | (136) |  | (399) |
Change in fair value of insurance-related derivatives and embedded derivatives |  | (54) |  | (54) |
Change in fair value of market risk benefits |  | 14 |  | 21 |
Future policy benefit remeasurement losses |  | 0 |  | 0 |
Commissions for acquiring and servicing policies |  | 0 |  | 0 |
Other operating expenses |  | 0 |  | 0 |
Operating expenses |  | (147) |  | (450) |
Interest expense |  | (27) |  | (73) |
Deferral of policy acquisition costs |  | 0 |  | 0 |
Other components of net periodic pension benefit (costs), net of tax |  | 0 |  | 0 |
Net income (loss) after reclassification adjustments |  | $ (837) |  | $ (2,711) |
American National, Conformed | Private loans |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Private loans |  |  |  |  | $ 194

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