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BUSINESS SEGMENT INFORMATION (Tables)
 6 Months Ended
Jun. 30, 2017
Segment Reporting [Abstract]  
Reconciliation of Revenue from Segments to Consolidated
  
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
(In millions)
2017
 
2016
 
2017
 
2016
 
Revenues:
 
 
 
 
 
 
 
 
Aflac Japan:
 
 
 
 
 
 
 
 
   Net earned premiums
$
3,222

 
$
3,402

 
$
6,416

 
$
6,581

 
   Net investment income, less amortized hedge costs (1)
557

 
605

 
1,115

 
1,195

 
   Other income
10

 
11

 
20

 
19

 
               Total Aflac Japan
3,789

 
4,018

 
7,551

 
7,795

 
Aflac U.S.:
 
 
 
 
 
 
 
 
   Net earned premiums
1,388

 
1,362

 
2,778

 
2,729

 
   Net investment income
180

 
176

 
358

 
350

 
   Other income
2

 
0

 
3

 
3

 
               Total Aflac U.S.
1,570

 
1,538

 
3,139

 
3,082

 
Other business segments
72

 
68

 
144

 
136

 
               Total business segment revenues
5,431

 
5,624

 
10,834

 
11,013

 
Corporate and eliminations
16

 
21

 
31

 
43

 
             Total operating revenues
5,447

 
5,645

 
10,865

 
11,056

 
Realized investment gains (losses) (1), (2), (3)
(19
)
 
(208
)
 
(128
)
 
(168
)
 
           Total revenues
$
5,428

 
$
5,437

 
$
10,737

 
$
10,888

 
(1) Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $56 and $37 for the three-month periods and $108 and $69 for the six-month periods ended June 30, 2017, and 2016, respectively, and have been reclassified from realized investment gains (losses) and reported as a deduction from net investment income when analyzing segment operations to conform to current year reporting.
(2) Excluding a gain of $20 and $21 for the three-month periods and $41 and $43 for the six-month periods ended June 30, 2017, and 2016, respectively, related to the interest rate component of the change in fair value of foreign currency swaps on notes payable which is classified as an operating gain when analyzing segment operations
(3) Prior year foreign currency transaction gains and losses have been reclassified from other non-operating income (loss) to realized investment gains (losses) to conform to current-year reporting classifications. These reclassifications had no impact on total revenues.
Reconciliation of Operating Profit (Loss) from Segments to Consolidated
  
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
(In millions)
2017
 
2016
 
2017
 
2016
 
Pretax earnings:
 
 
 
 
 
 
 
 
Aflac Japan (1)
$
791

 
$
802

 
$
1,560

 
$
1,608

 
Aflac U.S.
330

 
291

 
640

 
623

 
Other business segments
3

 
5

 
3

 
8

 
    Total business segment pretax operating earnings
1,124

 
1,098

 
2,203

 
2,239

 
Interest expense, noninsurance operations
(30
)
 
(30
)
 
(59
)
 
(59
)
 
Corporate and eliminations
(21
)
 
(26
)
 
(44
)
 
(61
)
 
    Pretax operating earnings
1,073

 
1,042

 
2,100

 
2,119

 
Realized investment gains (losses) (1), (2), (3)
(19
)
 
(208
)
 
(128
)
 
(168
)
 
Other non-operating income (loss) (3)
(9
)
 
0

 
(28
)
 
0

 
    Total earnings before income taxes
$
1,045

 
$
834

 
$
1,944

 
$
1,951

 
Income taxes applicable to pretax operating earnings
$
342

 
$
359

 
$
694

 
$
731

 
Effect of foreign currency translation on after-tax
operating earnings
(9
)
 
36

 
(3
)
 
49

 

(1) Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $56 and $37 for the three-month periods and $108 and $69 for the six-month periods ended June 30, 2017, and 2016, respectively, and have been reclassified from realized investment gains (losses) and reported as a deduction from pretax operating earnings when analyzing segment operations to conform to current year reporting.
(2) Excluding a gain of $20 and $21 for the three-month periods and $41 and $43 for the six-month periods ended June 30, 2017, and 2016, respectively, related to the interest rate component of the change in fair value of foreign currency swaps on notes payable which is classified as an operating gain when analyzing segment operations
(3) Prior year foreign currency transaction gains and losses have been reclassified from other non-operating income (loss) to realized investment gains (losses) to conform to current-year reporting classifications. These reclassifications had no impact on total earnings before income taxes.
Reconciliation of Assets from Segment to Consolidated
Assets were as follows:
(In millions)
June 30,
2017
 
December 31,
2016
Assets:
 
 
 
 
 
 
 
Aflac Japan
 
$
113,497

 
 
 
$
107,858

 
Aflac U.S.
 
19,996

 
 
 
19,453

 
Other business segments
 
471

 
 
 
270

 
    Total business segment assets
 
133,964

 
 
 
127,581

 
Corporate and eliminations
 
1,430

 
 
 
2,238

 
    Total assets
 
$
135,394

 
 
 
$
129,819