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BUSINESS SEGMENT INFORMATION (Tables)
 6 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Reconciliation of Revenue from Segments to Consolidated
  
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
(In millions)
2018
 
2017
 
2018
 
2017
 
Revenues:
 
 
 
 
 
 
 
 
Aflac Japan:
 
 
 
 
 
 
 
 
   Net earned premiums
$
3,227

 
$
3,222

 
$
6,490

 
$
6,416

 
   Net investment income, less amortized hedge costs (1)
606

 
557

 
1,194

 
1,115

 
   Other income
11

 
10

 
22

 
20

 
               Total Aflac Japan
3,844

 
3,789

 
7,706

 
7,551

 
Aflac U.S.:
 
 
 
 
 
 
 
 
   Net earned premiums
1,426

 
1,388

 
2,853

 
2,778

 
   Net investment income
182

 
180

 
357

 
358

 
   Other income
2

 
2

 
4

 
3

 
           Total Aflac U.S.
1,610

 
1,570

 
3,214

 
3,139

 
Corporate and other (2)
85

 
70

 
164

 
138

 
           Total adjusted revenues
5,539

 
5,429

 
11,084

 
10,828

 
Realized investment gains (losses) (1),(2)
50

 
(1
)
 
(30
)
 
(91
)
 
           Total revenues
$
5,589

 
$
5,428

 
$
11,054

 
$
10,737

 
(1) Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $55 and $56 for the three- month periods and $110 and $108 for the six-month periods ended June 30, 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 partially offset by derivatives entered into as part of corporate activities and resulted in a benefit of $7 for the three-month period and $9 for the six-month period ended June 30, 2018, respectively, 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
June 30,
 
Six Months Ended
June 30,
 
(In millions)
2018
 
2017
 
2018
 
2017
 
Pretax earnings:
 
 
 
 
 
 
 
 
Aflac Japan (1)
$
836

 
$
791

 
$
1,654

 
$
1,560

 
Aflac U.S.
340

 
330

 
677

 
640

 
Corporate and other (2)
(38
)
 
(48
)
 
(84
)
 
(100
)
 
    Pretax adjusted earnings
1,138

 
1,073

 
2,247

 
2,100

 
Realized investment gains (losses) (1),(2),(3)
35

 
(19
)
 
(63
)
 
(128
)
 
Other income (loss) 
(42
)
 
(9
)
 
(70
)
 
(28
)
 
    Total earnings before income taxes
$
1,131

 
$
1,045

 
$
2,114

 
$
1,944

 
Income taxes applicable to pretax adjusted earnings
$
303

 
$
342

 
$
592

 
$
694

 
Effect of foreign currency translation on after-tax
adjusted earnings
7

 
(9
)
 
29

 
(3
)
 

(1) Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $55 and $56 for the three- month periods and $110 and $108 for the six-month periods ended June 30, 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 partially offset by derivatives entered into as part of corporate activities and resulted in a benefit of $7 for the three-month period and $9 for the six-month period ended June 30, 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 $20 for the three-month periods and $33 and $41 for the six-month periods ended June 30, 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)
June 30,
2018
 
December 31,
2017
Assets:
 
 
 
 
 
 
 
Aflac Japan
 
$
120,228

 
 
 
$
114,402

 
Aflac U.S.
 
19,588

 
 
 
19,893

 
Corporate and other
 
2,170

 
 
 
2,922

 
    Total assets
 
$
141,986

 
 
 
$
137,217