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Segment Reporting - Schedule of Segment Results (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Total revenues $ 2,058 $ 2,004 $ 6,583 $ 5,789
Policyholder benefits, net 527 846 2,243 2,962
Interest sensitive contract benefits, excluding index credits 523 523 1,520 1,068
Amortization of deferred policy acquisition costs, deferred sales inducements and value of business acquired 345 289 995 649
Operating expenses, excluding transactions costs 156 228 647 666
Income tax expense (recovery), net 119 (77) 102 (337)
Depreciation and amortization expenses (35) (25) (125) (49)
Deferred income tax recovery (expense) relating to basis and other changes (25) 105 147 432
Transaction costs 10 (32) (27) (163)
Mark-to-market gains (losses) on investments, including reinsurance funds withheld (117) 128 (342) 487
Mark-to-market gains (losses) on insurance contracts and other net assets 21 (835) (597) (1,461)
Net income (loss) attributable to American National Group Inc. common stockholder 208 (299) 113 58
Operating Segments        
Segment Reporting Information [Line Items]        
Total revenues 2,143 2,265 6,825 6,044
Segment DOE 464 407 1,375 904
Corporate and Other        
Segment Reporting Information [Line Items]        
Segment DOE (110) (47) (318) (92)
Annuities | Operating Segments        
Segment Reporting Information [Line Items]        
Net premiums and other policy related revenues 308 471 1,281 1,586
Net investment income, including reinsurance funds withheld 1,285 1,034 3,761 2,056
Total revenues 1,593 1,505 5,042 3,642
Policyholder benefits, net 221 443 1,031 1,521
Interest sensitive contract benefits, excluding index credits 529 402 1,489 807
Amortization of deferred policy acquisition costs, deferred sales inducements and value of business acquired 247 175 692 294
Other insurance and reinsurance expenses 100 44 313 71
Operating expenses, excluding transactions costs 107 99 349 186
Income tax expense (recovery), net       72
Segment DOE 389 342 1,168 691
P&C | Operating Segments        
Segment Reporting Information [Line Items]        
Net premiums and other policy related revenues 364 473 1,204 1,411
Net investment income, including reinsurance funds withheld 41 43 123 131
Total revenues 405 516 1,327 1,542
Policyholder benefits, net 255 329 861 1,040
Interest sensitive contract benefits, excluding index credits 0 0 0 0
Amortization of deferred policy acquisition costs, deferred sales inducements and value of business acquired 83 99 272 314
Other insurance and reinsurance expenses 0 0 0 0
Operating expenses, excluding transactions costs 29 65 96 141
Income tax expense (recovery), net       (4)
Segment DOE 38 23 98 51
Life Insurance | Operating Segments        
Segment Reporting Information [Line Items]        
Net premiums and other policy related revenues 96 164 300 556
Net investment income, including reinsurance funds withheld 49 80 156 304
Total revenues 145 244 456 860
Policyholder benefits, net 69 117 232 425
Interest sensitive contract benefits, excluding index credits 10 8 23 34
Amortization of deferred policy acquisition costs, deferred sales inducements and value of business acquired 15 15 31 41
Other insurance and reinsurance expenses 0 0 0 0
Operating expenses, excluding transactions costs 14 62 61 186
Income tax expense (recovery), net       12
Segment DOE $ 37 $ 42 $ 109 $ 162