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BUSINESS SEGMENT INFORMATION
 3 Months Ended
Jun. 30, 2021
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, 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 Aflac’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
June 30,		Six Months Ended
June 30,
(In millions)2021202020212020
Revenues:
Aflac Japan:
   Net earned premiums$2,987 $3,158 $6,111 $6,308 
   Adjusted net investment income (1),(2)
792 633 1,497 1,276 
   Other income10 12 22 22 
               Total adjusted revenue Aflac Japan3,789 3,803 7,630 7,606 
Aflac U.S.:
   Net earned premiums1,408 1,458 2,830 2,941 
   Adjusted net investment income189 172 366 348 
   Other income30 26 58 54 
           Total adjusted revenue Aflac U.S.1,627 1,656 3,254 3,343 
Corporate and other (3),(4)
50 100 133 204 
           Total adjusted revenues5,466 5,559 11,017 11,153 
Net investment gains (losses) (1),(2),(3)
98 (152)416 (584)
           Total revenues$5,564 $5,407 $11,433 $10,569 
(1) Amortized hedge costs of $17 and $50 for the three-month periods and $36 and $105 for the six-month periods ended June 30, 2021, and 2020, 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 $(9) and $6 for the three-month periods and $(17) and an immaterial amount for the six-month periods ended June 30, 2021 and 2020, 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) Amortized hedge income of $16 and $27 for the three-month periods and $33 and $56 for the six-month periods ended June 30, 2021, and 2020, 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.
(4) Amortization of federal historic rehabilitation and solar investments in partnerships of $30 for the three- and six-month periods ended June 30, 2021, are included as a reduction to net investment income. Offsetting tax credits on these investments of $12 and $25 for the three- and six-month periods ended June 30, 2021, respectively, have been recorded as an income tax benefit on 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
June 30,		Six Months Ended
June 30,
(In millions)2021202020212020
Pretax earnings:
Aflac Japan (1),(2)
$1,004 $839 $1,891 $1,694 
Aflac U.S.413 426 859 752 
Corporate and other (3),(4),(5)
(76)(30)(102)(28)
    Pretax adjusted earnings (6)
1,341 1,235 2,648 2,418 
Net investment gains (losses) (1),(2),(3),(4)
85 (166)388 (614)
Other income (loss)(53)1 (59)(15)
    Total earnings before income taxes$1,373 $1,070 $2,977 $1,789 
Income taxes applicable to pretax adjusted earnings$262 $315 $510 $615 
Effect of foreign currency translation on after-tax
  adjusted earnings		(6)5 7 14 
(1) Amortized hedge costs of $17 and $50 for the three-month periods and $36 and $105 for the six-month periods ended June 30, 2021, and 2020, 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 $(9) and $6 for the three-month periods and $(17) and an immaterial amount for the six-month periods ended June 30, 2021 and 2020, 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) Amortized hedge income of $16 and $27 for the three-month periods and $33 and $56 for the six-month periods ended June 30, 2021, and 2020, 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.
(4) A gain of $14 for the three-month periods and $27 and $30 for the six-month periods ended June 30, 2021, and 2020, 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.
(5) Amortization of federal historic rehabilitation and solar investments in partnerships of $30 for the three- and six-month periods ended June 30, 2021, is included as a reduction to net investment income. Offsetting tax credits on these investments of $12 and $25 for the three- and six-month periods ended June 30, 2021, respectively, have been recorded as an income tax benefit. See Note 3 of the Notes to the Consolidated Financial Statements for additional information on these investments.
(6) Includes $45 and $44 for the three-month periods and $89 and $77 for the six-month periods ended June 30, 2021, and 2020, respectively, of interest expense on debt.

Assets were as follows:
(In millions)June 30,
2021		December 31,
2020
Assets:
Aflac Japan$132,527 $137,271 
Aflac U.S.23,033 22,864 
Corporate and other5,932 4,951 
    Total assets$161,492 $165,086