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BUSINESS SEGMENT INFORMATION (Tables)
9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Reconciliation of Revenue from Segments to Consolidated
  
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
(In millions)
2017
 
2016
 
2017
 
2016
 
Revenues:
 
 
 
 
 
 
 
 
Aflac Japan:
 
 
 
 
 
 
 
 
   Net earned premiums
$
3,200

 
$
3,596

 
$
9,616

 
$
10,177

 
   Net investment income, less amortized hedge costs (1)
561

 
607

 
1,676

 
1,802

 
   Other income
11

 
10

 
31

 
29

 
               Total Aflac Japan
3,772

 
4,213

 
11,323

 
12,008

 
Aflac U.S.:
 
 
 
 
 
 
 
 
   Net earned premiums
1,393

 
1,365

 
4,172

 
4,093

 
   Net investment income
181

 
176

 
539

 
526

 
   Other income
1

 
1

 
3

 
5

 
               Total Aflac U.S.
1,575

 
1,542

 
4,714

 
4,624

 
Other business segments
69

 
71

 
204

 
207

 
               Total business segment revenues
5,416

 
5,826

 
16,241

 
16,839

 
Corporate and eliminations
19

 
20

 
59

 
63

 
             Total operating revenues
5,435

 
5,846

 
16,300

 
16,902

 
Realized investment gains (losses) (1), (2), (3)
71

 
(130
)
 
(57
)
 
(298
)
 
           Total revenues
$
5,506

 
$
5,716

 
$
16,243

 
$
16,604

 
(1) Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $60 and $54 for the three-month periods and $168 and $123 for the nine-month periods ended September 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 $19 and $20 for the three-month periods and $60 and $64 for the nine-month periods ended September 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
September 30,
 
Nine Months Ended
September 30,
 
(In millions)
2017
 
2016
 
2017
 
2016
 
Pretax earnings:
 
 
 
 
 
 
 
 
Aflac Japan (1)
$
748

 
$
827

 
$
2,308

 
$
2,436

 
Aflac U.S.
316

 
323

 
956

 
946

 
Other business segments
5

 
4

 
9

 
12

 
    Total business segment pretax operating earnings
1,069

 
1,154

 
3,273

 
3,394

 
Interest expense, noninsurance operations
(30
)
 
(31
)
 
(89
)
 
(90
)
 
Corporate and eliminations
(25
)
 
(31
)
 
(70
)
 
(91
)
 
    Pretax operating earnings
1,014

 
1,092

 
3,114

 
3,213

 
Realized investment gains (losses) (1), (2), (3)
71

 
(130
)
 
(57
)
 
(298
)
 
Other non-operating income (loss) (3)
(10
)
 
1

 
(38
)
 
(1
)
 
    Total earnings before income taxes
$
1,075

 
$
963

 
$
3,019

 
$
2,914

 
Income taxes applicable to pretax operating earnings
$
338

 
$
379

 
$
1,031

 
$
1,112

 
Effect of foreign currency translation on after-tax
operating earnings
(29
)
 
61

 
(31
)
 
110

 

(1) Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $60 and $54 for the three-month periods and $168 and $123 for the nine-month periods ended September 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 $19 and $20 for the three-month periods and $60 and $64 for the nine-month periods ended September 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)
September 30,
2017
 
December 31,
2016
Assets:
 
 
 
 
 
 
 
Aflac Japan
 
$
113,625

 
 
 
$
107,858

 
Aflac U.S.
 
20,348

 
 
 
19,453

 
Other business segments
 
513

 
 
 
270

 
    Total business segment assets
 
134,486

 
 
 
127,581

 
Corporate and eliminations
 
1,597

 
 
 
2,238

 
    Total assets
 
$
136,083

 
 
 
$
129,819