v3.25.2
DEFERRED POLICY ACQUISITION COSTS - Schedule Of Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     $ 8,758 $ 9,132 $ 9,132
Capitalization     503   1,056
Amortization expense $ (221) $ (208) (437) (424) (851)
Foreign currency translation and other     472   (579)
Balance, end of period 9,296   9,296   8,758
Aflac Japan | Cancer          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     2,776 2,971 2,971
Capitalization     139   300
Amortization expense     (94)   (184)
Foreign currency translation and other     257   (311)
Balance, end of period 3,078   3,078   2,776
Aflac Japan | Medical and other health          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     1,833 2,041 2,041
Capitalization     46   103
Amortization expense     (51)   (100)
Foreign currency translation and other     170   (211)
Balance, end of period 1,998   1,998   1,833
Aflac Japan | Life insurance          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     441 491 491
Capitalization     17   36
Amortization expense     (17)   (34)
Foreign currency translation and other     41   (52)
Balance, end of period 482   482   441
Aflac Japan | Other          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     52 56 56
Capitalization     2   4
Amortization expense     (2)   (3)
Foreign currency translation and other     4   (5)
Balance, end of period 56   56   52
Aflac U.S. | Life insurance          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     219 172 172
Capitalization     47   77
Amortization expense     (19)   (30)
Foreign currency translation and other     0   0
Balance, end of period 247   247   219
Aflac U.S. | Accident          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     915 917 917
Capitalization     65   141
Amortization expense     (72)   (143)
Foreign currency translation and other     0   0
Balance, end of period 908   908   915
Aflac U.S. | Disability          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     636 625 625
Capitalization     61   129
Amortization expense     (61)   (118)
Foreign currency translation and other     0   0
Balance, end of period 636   636   636
Aflac U.S. | Critical Care          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     1,348 1,336 1,336
Capitalization     78   165
Amortization expense     (77)   (153)
Foreign currency translation and other     0   0
Balance, end of period 1,349   1,349   1,348
Aflac U.S. | Hospital Indemnity          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     452 436 436
Capitalization     42   89
Amortization expense     (38)   (73)
Foreign currency translation and other     0   0
Balance, end of period 456   456   452
Aflac U.S. | Dental/Vision          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     86 86 86
Capitalization     6   12
Amortization expense     (6)   (12)
Foreign currency translation and other     0   0
Balance, end of period 86   86   86
Aflac U.S. | Other          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     0 $ 1 1
Capitalization     0   0
Amortization expense     0   (1)
Foreign currency translation and other     0   0
Balance, end of period $ 0   $ 0   $ 0