v3.26.3
DEFERRED POLICY ACQUISITION COSTS - Schedule Of Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     $ 9,034 $ 8,758 $ 8,758
Capitalization         1,105
Amortization expense $ (220) $ (218) (659) (655) (874)
Foreign currency translation and other         45
Balance, end of period 9,186   9,186   9,034
Long-duration contracts          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     9,034    
Capitalization     823    
Amortization expense     (659)    
Foreign currency translation and other     (25)    
Balance, end of period 9,173   9,173   9,034
Short-duration contracts          
Deferred Policy Acquisition Cost [Line Items]          
Balance, end of period 13   13    
Aflac Japan | Cancer          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     2,965 2,776 2,776
Capitalization     258   357
Amortization expense     (140)   (188)
Foreign currency translation and other     (14)   20
Balance, end of period 3,069   3,069   2,965
Aflac Japan | Medical and other health          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     1,840 1,833 1,833
Capitalization     71   85
Amortization expense     (68)   (99)
Foreign currency translation and other     (9)   21
Balance, end of period 1,834   1,834   1,840
Aflac Japan | Life insurance          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     446 441 441
Capitalization     31   33
Amortization expense     (23)   (33)
Foreign currency translation and other     (2)   5
Balance, end of period 452   452   446
Aflac Japan | Other          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     51 52 52
Capitalization     1   3
Amortization expense     (2)   (3)
Foreign currency translation and other     0   (1)
Balance, end of period 50   50   51
Aflac U.S. | Life insurance          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     277 219 219
Capitalization     96   98
Amortization expense     (36)   (40)
Foreign currency translation and other     0   0
Balance, end of period 337   337   277
Aflac U.S. | Accident          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     909 915 915
Capitalization     96   137
Amortization expense     (109)   (143)
Foreign currency translation and other     0   0
Balance, end of period 896   896   909
Aflac U.S. | Disability          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     641 636 636
Capitalization     89   127
Amortization expense     (92)   (122)
Foreign currency translation and other     0   0
Balance, end of period 638   638   641
Aflac U.S. | Critical care          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     1,355 1,348 1,348
Capitalization     111   162
Amortization expense     (119)   (155)
Foreign currency translation and other     0   0
Balance, end of period 1,347   1,347   1,355
Aflac U.S. | Hospital indemnity          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     463 452 452
Capitalization     61   90
Amortization expense     (61)   (79)
Foreign currency translation and other     0   0
Balance, end of period 463   463   463
Aflac U.S. | Dental/vision          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     87 86 86
Capitalization     9   13
Amortization expense     (9)   (12)
Foreign currency translation and other     0   0
Balance, end of period 87   87   87
Aflac U.S. | Other          
Deferred Policy Acquisition Cost [Line Items]          
Balance, beginning of period     0 $ 0 0
Capitalization     0   0
Amortization expense     0   0
Foreign currency translation and other     0   0
Balance, end of period $ 0   $ 0   $ 0