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BUSINESS SEGMENT INFORMATION (Tables)
 3 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Reconciliation of Revenue from Segments to Consolidated
  
Three Months Ended
March 31,
 
(In millions)
2018
 
2017
 
Revenues:
 
 
 
 
Aflac Japan:
 
 
 
 
   Net earned premiums
$
3,263

 
$
3,194

 
   Net investment income, less amortized hedge costs (1)
588

 
557

 
   Other income
12

 
10

 
               Total Aflac Japan
3,863

 
3,761

 
Aflac U.S.:
 
 
 
 
   Net earned premiums
1,427

 
1,390

 
   Net investment income
175

 
178

 
   Other income
2

 
1

 
           Total Aflac U.S.
1,604

 
1,569

 
Corporate and other (2)
79

 
67

 
           Total adjusted revenues
5,546

 
5,397

 
Realized investment gains (losses) (1),(2)
(82
)
 
(88
)
 
           Total revenues
$
5,464

 
$
5,309

 
(1) Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $55 and $52 for the three-month periods ended March 31, 2018, and 2017, respectively, and have been reclassified from realized investment gains (losses) and reported as a deduction from net investment income when analyzing segment operations.
(2) Amortized hedge costs in Aflac Japan were offset by derivatives entered into as part of corporate activities and resulted in a benefit of $2 for the three-month period ended March 31, 2018 which has been reclassified from realized investment gains (losses) and reported as an increase in net investment income when analyzing operations.
Reconciliation of Adjusted Profit (Loss) from Segments to Consolidated
  
Three Months Ended
March 31,
 
(In millions)
2018
 
2017
 
Pretax earnings:
 
 
 
 
Aflac Japan (1)
$
818

 
$
769

 
Aflac U.S.
337

 
310

 
Corporate and other (2)
(46
)
 
(52
)
 
    Pretax adjusted earnings
1,109

 
1,027

 
Realized investment gains (losses) (1),(2),(3)
(98
)
 
(109
)
 
Other income (loss) 
(29
)
 
(20
)
 
    Total earnings before income taxes
$
982

 
$
898

 
Income taxes applicable to pretax adjusted earnings
$
289

 
$
351

 
Effect of foreign currency translation on after-tax
adjusted earnings
21

 
5

 

(1) Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $55 and $52 for the three-month periods ended March 31, 2018, and 2017, respectively, and have been reclassified from realized investment gains (losses) and reported as a deduction from pretax adjusted earnings when analyzing segment operations.
(2) Amortized hedge costs in Aflac Japan were offset by derivatives entered into as part of corporate activities and resulted in a benefit of $2 for the three-month period ended March 31, 2018 which has been reclassified from realized investment gains (losses) and reported as an increase in pretax adjusted earnings when analyzing operations.
(3) Excluding a gain of $17 and $21 for the three-month periods ended March 31, 2018, and 2017, respectively, related to the interest rate component of the change in fair value of foreign currency swaps on notes payable which is included in adjusted earnings when analyzing segment operations
Reconciliation of Assets from Segment to Consolidated
Assets were as follows:
(In millions)
March 31,
2018
 
December 31,
2017
Assets:
 
 
 
 
 
 
 
Aflac Japan
 
$
125,174

 
 
 
$
114,402

 
Aflac U.S.
 
19,706

 
 
 
19,893

 
Corporate and other
 
2,476

 
 
 
2,922

 
    Total assets
 
$
147,356

 
 
 
$
137,217