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BUSINESS SEGMENT INFORMATION
 3 Months Ended
Sep. 30, 2022
Segment Reporting [Abstract]  
BUSINESS SEGMENT INFORMATION BUSINESS SEGMENT INFORMATION
The Company consists of two reportable insurance business segments: Aflac Japan and Aflac U.S., both of which sell supplemental health and life insurance. In addition, the Parent Company, other operating business units that are not individually reportable, and business activities, including reinsurance retrocession activities, not included in Aflac Japan or Aflac U.S. are included in Corporate and other.

The Company does not allocate corporate overhead expenses to business segments. Consistent with U.S. GAAP accounting guidance for segment reporting, the Company evaluates and manages its business segments using a financial performance measure called pretax adjusted earnings. Adjusted earnings are adjusted revenues less benefits and adjusted expenses. The adjustments to both revenues and expenses account for certain items that cannot be predicted or that are outside management’s control. Adjusted revenues are U.S. GAAP total revenues excluding net investment gains and losses, except for amortized hedge costs/income related to foreign currency exposure management strategies and net interest cash flows from derivatives associated with certain investment strategies. Adjusted expenses are U.S. GAAP total acquisition and operating expenses including the impact of interest cash flows from derivatives associated with notes payable but excluding any nonrecurring or other items not associated with the normal course of the Company’s insurance operations and that do not reflect the Company's underlying business performance. The Company excludes income taxes related to operations to arrive at pretax adjusted earnings. Information regarding operations by reportable segment and Corporate and other, follows:
  
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)2022202120222021
Revenues:
Aflac Japan:
   Net earned premiums$2,241 $2,934 $7,384 $9,045 
   Adjusted net investment income (1),(2)
663 763 2,066 2,260 
   Other income9 10 26 32 
               Total adjusted revenue Aflac Japan2,913 3,707 9,476 11,337 
Aflac U.S.:
   Net earned premiums1,375 1,393 4,182 4,223 
   Adjusted net investment income (3)
185 191 563 557 
   Other income38 32 120 90 
           Total adjusted revenue Aflac U.S.1,598 1,616 4,865 4,870 
Corporate and other (4),(5)
73 72 189 205 
           Total adjusted revenues4,584 5,395 14,530 16,412 
Net investment gains (losses) (1),(2),(3),(4)
236 (158)962 258 
           Total revenues$4,820 $5,237 $15,492 $16,670 
(1) Amortized hedge costs of $28 and $20 for the three-month periods and $84 and $55 for the nine-month periods ended September 30, 2022, and 2021, respectively, related to certain foreign currency exposure management strategies have been reclassified from net investment gains (losses) and reported as a deduction from net investment income when analyzing operations.
(2) Net interest cash flows from derivatives associated with certain investment strategies of $(25) and $(7) for the three-month periods and $(37) and $(24) for the nine-month periods ended September 30, 2022, and 2021, respectively, have been reclassified from net investment gains (losses) and included in adjusted earnings as a component of net investment income when analyzing operations.
(3) Net interest cash flows from derivatives associated with certain investment strategies of $(1) and $1 for the three-month periods and $1 and $1 for the nine-month periods ended September 30, 2022, and 2021, have been reclassified from net investment gains (losses) and included in adjusted earnings as a component of net investment income when analyzing operations.
(4) Amortized hedge income of $19 and $13 for the three-month periods and $44 and $45 for the nine-month periods ended September 30, 2022, and 2021, respectively, related to certain foreign currency exposure management strategies has been reclassified from net investment gains (losses) and reported as an increase to net investment income when analyzing operations.
(5) The change in value of federal historic rehabilitation and solar investments in partnerships of $19 and $5 for the three-month periods and $61 and $35 for the nine-month periods ended September 30, 2022, and 2021, respectively, is included as a reduction to net investment income. Tax credits on these investments of $19 and $10 for the three-month periods and $63 and $35 for the nine-month periods ended September 30, 2022, and 2021, respectively, have been recorded as an income tax benefit in the consolidated statement of earnings. See Note 3 of the Notes to the Consolidated Financial Statements for additional information on these investments.
  
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)2022202120222021
Pretax earnings:
Aflac Japan (1),(2)
$630 $976 $2,351 $2,867 
Aflac U.S. (3)
309 358 984 1,217 
Corporate and other (4),(5),(6)
(59)(41)(179)(144)
    Pretax adjusted earnings (7)
880 1,293 3,156 3,940 
Net investment gains (losses) (1),(2),(3),(4),(5)
222 (172)923 216 
Other income (loss)1 (8)1 (66)
    Total earnings before income taxes$1,103 $1,113 $4,080 $4,090 
Income taxes applicable to pretax adjusted earnings$156 $262 $565 $771 
Effect of foreign currency translation on after-tax
  adjusted earnings		(53)(14)(147)(8)
(1) Amortized hedge costs of $28 and $20 for the three-month periods and $84 and $55 for the nine-month periods ended September 30, 2022, and 2021, respectively, related to certain foreign currency exposure management strategies have been reclassified from net investment gains (losses) and reported as a deduction from net investment income when analyzing operations.
(2) Net interest cash flows from derivatives associated with certain investment strategies of $(25) and $(7) for the three-month periods and $(37) and $(24) for the nine-month periods ended September 30, 2022, and 2021, respectively, have been reclassified from net investment gains (losses) and included in adjusted earnings as a component of net investment income when analyzing operations.
(3) Net interest cash flows from derivatives associated with certain investment strategies of $(1) and $1 for the three-month periods and $1 and $1 for the nine-month periods ended September 30, 2022, and 2021, have been reclassified from net investment gains (losses) and included in adjusted earnings as a component of net investment income when analyzing operations.
(4) Amortized hedge income of $19 and $13 for the three-month periods and $44 and $45 for the nine-month periods ended September 30, 2022, and 2021, respectively, related to certain foreign currency exposure management strategies has been reclassified from net investment gains (losses) and reported as an increase in net investment income when analyzing operations.
(5) A gain of $13 and $14 for the three-month periods and $38 and $41 for the nine-month periods ended September 30, 2022, and 2021, respectively, related to the interest rate component of the change in fair value of foreign currency swaps on notes payable has been reclassified from net investment gains (losses) and included in adjusted earnings when analyzing operations.
(6) The change in value of federal historic rehabilitation and solar investments in partnerships of $19 and $5 for the three-month periods and $61 and $35 for the nine-month periods ended September 30, 2022, and 2021, respectively, is included as a reduction to net investment income. Tax credits on these investments of $19 and $10 for the three-month periods and $63 and $35 for the nine-month periods ended September 30, 2022, and 2021, respectively, have been recorded as an income tax benefit in the consolidated statement of earnings. See Note 3 of the Notes to the Consolidated Financial Statements for additional information on these investments.
(7) Includes $45 and $40 for the three-month periods and $127 and $130 for the nine-month periods ended September 30, 2022, and 2021, respectively, of interest expense on debt.

Assets were as follows:
(In millions)September 30,
2022		December 31,
2021
Assets:
Aflac Japan$101,311 $128,536 
Aflac U.S.20,212 23,106 
Corporate and other6,577 5,900 
    Total assets$128,100 $157,542