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BUSINESS SEGMENT INFORMATION
 9 Months Ended
Sep. 30, 2020
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
September 30,		Nine Months Ended
September 30,
(In millions)2020201920202019
Revenues:
Aflac Japan:
   Net earned premiums$3,168 $3,241 $9,476 $9,593 
   Adjusted net investment income (1),(2)
663 659 1,939 1,878 
   Other income11 12 32 34 
               Total adjusted revenue Aflac Japan3,842 3,912 11,447 11,505 
Aflac U.S.:
   Net earned premiums1,407 1,445 4,348 4,365 
   Net investment income (3)
175 183 523 540 
   Other income24 2 78 6 
           Total adjusted revenue Aflac U.S.1,606 1,630 4,949 4,911 
Corporate and other (4)
87 97 292 287 
           Total adjusted revenues5,535 5,639 16,688 16,703 
Net investment gains (losses) (1),(2),(3),(4)
130 (103)(454)1 
           Total revenues$5,665 $5,536 $16,234 $16,704 
(1) Amortized hedge costs of $51 and $66 for the three-month periods and $155 and $191 for the nine-month periods ended September 30, 2020, and 2019, 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 $6 and $(4) for the three-month periods and $5 and $(18) for the nine-month periods ended September 30, 2020 and 2019, respectively, have been reclassified from net investment gains (losses) and included in adjusted earnings as a component of net investment income.
(3) Net interest cash flows from derivatives associated with certain investment strategies of $1 for the three-month period and $2 for the nine-month period ended September 30, 2020, respectively, have been reclassified from net investment gains (losses) and included in adjusted earnings as a component of net investment income.
(4) Amortized hedge income of $22 and $21 for the three-month periods $78 and $61 for the nine-month periods ended September 30, 2020, and 2019, 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.
  
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)2020201920202019
Pretax adjusted earnings:
Aflac Japan (1),(2)
$747 $838 $2,442 $2,504 
Aflac U.S. (3)
329 335 1,082 996 
Corporate and other (4),(5)
(39)(17)(69)(62)
    Pretax adjusted earnings (6)
1,037 1,156 3,455 3,438 
Net investment gains (losses) (1),(2),(3),(4),(5)
117 (120)(497)(49)
Other income (loss)(1)0 (16)(1)
    Total earnings before income taxes$1,153 $1,036 $2,942 $3,388 
Income taxes applicable to pretax adjusted earnings$43 $293 $659 $880 
Effect of foreign currency translation on after-tax
adjusted earnings		3 15 17 2 
(1) Amortized hedge costs of $51 and $66 for the three-month periods and $155 and $191 for the nine-month periods ended September 30, 2020, and 2019, 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 $6 and $(4) for the three-month periods and $5 and $(18) for the nine-month periods ended September 30, 2020 and 2019, respectively, have been reclassified from net investment gains (losses) and included in adjusted earnings as a component of net investment income.
(3) Net interest cash flows from derivatives associated with certain investment strategies of $1 for the three-month period and $2 for the nine-month period ended September 30, 2020, respectively, have been reclassified from net investment gains (losses) and included in adjusted earnings as a component of net investment income.
(4) Amortized hedge income of $22 and $21 for the three-month periods and $78 and $61 for the nine-month periods ended September 30, 2020, and 2019, 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 $16 for three-month periods and $43 and $50 for the nine-month periods ended September 30, 2020, and 2019, 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) Includes $44 and $34 for the three-month periods and $122 and $100 for the nine-month periods ended September 30, 2020, and 2019, respectively, of interest expense on debt.

Assets were as follows:
(In millions)September 30,
2020		December 31,
2019
Assets:
Aflac Japan$133,995 $127,523 
Aflac U.S.22,621 20,945 
Corporate and other4,339 4,300 
    Total assets$160,955 $152,768