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BUSINESS SEGMENT AND FOREIGN INFORMATION (Tables)
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Reconciliation of Revenue from Segments to Consolidated Information regarding operations by segment for the years ended December 31 follows:
(In millions)
2018
 
2017
 
2016
Revenues:
 
 
 
 
 
 
 
 
 
 
 
Aflac Japan:
 
 
 
 
 
 
 
 
 
 
 
   Net earned premiums:
 
 
 
 
 
 
 
 
 
 
 
             Cancer
 
$
5,849

 
 
 
$
5,612

 
 
 
$
5,639

 
             Medical and other health
 
3,516

 
 
 
3,379

 
 
 
3,429

 
             Life insurance
 
3,397

 
 
 
3,761

 
 
 
4,469

 
   Net investment income, less amortized hedge costs
 
2,403

 
 
 
2,235

 
 
 
2,368

 
   Other income
 
41

 
 
 
41

 
 
 
40

 
               Total Aflac Japan
 
15,206

 
 
 
15,028

 
 
 
15,945

 
Aflac U.S.:
 
 
 
 
 
 
 
 
 
 
 
   Net earned premiums:
 
 
 
 
 
 
 
 
 
 
 
             Accident/disability
 
2,611

 
 
 
2,537

 
 
 
2,469

 
             Cancer
 
1,311

 
 
 
1,308

 
 
 
1,299

 
             Other health
 
1,508

 
 
 
1,445

 
 
 
1,415

 
             Life insurance
 
278

 
 
 
273

 
 
 
271

 
   Net investment income
 
727

 
 
 
721

 
 
 
703

 
   Other income
 
8

 
 
 
5

 
 
 
10

 
           Total Aflac U.S.
 
6,443

 
 
 
6,289

 
 
 
6,167

 
Corporate and other
 
339

 
 
 
272

 
 
 
275

 
           Total adjusted revenues
 
21,988

 
 
 
21,589

 
 
 
22,387

 
Realized investment gains (losses) (1),(2),(3)
 
(230
)
 
 
 
78

 
 
 
172

 
           Total revenues
 
$
21,758

 
 
 
$
21,667

 
 
 
$
22,559

 

(1) Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $236, $228 and $186 for 2018, 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.
(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 $36 for 2018, which has been reclassified from realized investment gains (losses) and reported as an increase in net investment income when analyzing operations.
(3) An immaterial amount of net interest cash flows from derivatives associated with certain investment strategies in 2018, were reclassified from realized investment gains (losses) into net investment income when analyzing operations.
Reconciliation of Adjusted Profit (Loss) from Segments to Consolidated
(In millions)
2018
 
2017
 
2016
Pretax earnings:
 
 
 
 
 
 
 
 
 
 
 
Aflac Japan
 
$
3,208

 
 
 
$
3,054

 
 
 
$
3,148

 
Aflac U.S.
 
1,285

 
 
 
1,245

 
 
 
1,208

 
Corporate and other
 
(139
)
 
 
 
(212
)
 
 
 
(239
)
 
    Pretax adjusted earnings
 
4,354

 
 
 
4,087

 
 
 
4,117

 
Realized investment gains (losses) (1),(2),(3),(4)
 
(297
)
 
 
 
0

 
 
 
87

 
Other income (loss) (5)
 
(74
)

 
 
(69
)
 
 
 
(137
)

    Total earnings before income taxes
 
$
3,983

 
 
 
$
4,018

 
 
 
$
4,067

 
Income taxes applicable to pretax adjusted earnings
 
$
1,129

 
 
 
$
1,370

 
 
 
$
1,426

 
Effect of foreign currency translation on after-tax
adjusted earnings
 
28

 
 
 
(41
)
 
 
 
141

 

(1) Amortized hedge costs related to hedging U.S. dollar-denominated investments held in Aflac Japan were $236, $228 and $186 for 2018, 2017 and 2016, 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 $36 for 2018, which has been reclassified from realized investment gains (losses) and reported as an increase in pretax adjusted earnings when analyzing operations.
(3) An immaterial amount of net interest cash flows from derivatives associated with certain investment strategies in 2018, were reclassified from realized investment gains (losses) into net investment income when analyzing operations.
(4) Excluding a gain of $67 in 2018, $77 in 2017 and $85 in 2016, 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
(5) Includes expense of $13 in 2017 and $137 in 2016 for the early extinguishment of debt

Reconciliation of Assets from Segment to Consolidated Assets as of December 31 were as follows:
(In millions)
2018
 
2017
 
Assets:
 
 
 
 
 
 
 
 
Aflac Japan
 
$
118,342

 
 
 
$
114,402

 
 
Aflac U.S.
 
19,100

 
 
 
19,893

 
 
Corporate and other
 
2,964

 
 
 
2,922

 
 
    Total assets
 
$
140,406

 
 
 
$
137,217

 
 
Foreign Currency Disclosure Yen-Translation Effects: The following table shows the yen/dollar exchange rates used for or during the periods ended December 31. Exchange effects were calculated using the same yen/dollar exchange rate for the current year as for each respective prior year.
 
2018
 
2017
 
2016
Statements of Earnings:
 
 
 
 
 
 
 
 
 
 
 
Weighted-average yen/dollar exchange rate(1)
 
110.39

 
 
 
112.16

 
 
 
108.70

 
Yen percent strengthening (weakening)
 
1.6
%
 
 
 
(3.1
)%
 
 
 
11.3
%
 
Exchange effect on pretax operating earnings (in millions)
 
$
38

 
 
 
$
(63
)
 
 
 
$
218

 

 
2018
 
2017
Balance Sheets:
 
 
 
 
 
 
 
Yen/dollar exchange rate at December 31(1)
 
111.00

 
 
 
113.00

 
Yen percent strengthening (weakening)
 
1.8
%
 
 
 
3.1
%
 
Exchange effect on total assets (in millions)
 
$
1,362

 
 
 
$
2,593

 
Exchange effect on total liabilities (in millions)
 
1,270

 
 
 
2,848

 

(1) Rates are based on the published MUFG Bank, Ltd. telegraphic transfer middle rate (TTM)
Schedule of Intercompany Transfers of Funds Information on transfers for each of the years ended December 31 is shown below. See Note 13 for information concerning restrictions on transfers from Aflac Japan.
(In millions)
2018
 
2017
 
2016
Management fees
 
$
136

 
 
 
$
93

 
 
 
$
79

 
Allocated expenses
 
24

 
 
 
109

 
 
 
106

 
Profit remittances
 
808

 
 
 
1,150

 
 
 
1,286

 
Total transfers from Aflac Japan
 
$
968

 
 
 
$
1,352

 
 
 
$
1,471

 
Property, Plant and Equipment Classes of property and equipment as of December 31 were as follows:
(In millions)
2018
 
2017
Property and equipment:
 
 
 
 
 
 
 
Land
 
$
168

 
 
 
$
168

 
Buildings
 
456

 
 
 
441

 
Equipment and furniture
 
400

 
 
 
372

 
Total property and equipment
 
1,024

 
 
 
981

 
Less accumulated depreciation
 
581

 
 
 
547

 
Net property and equipment
 
$
443

 
 
 
$
434