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BUSINESS SEGMENT INFORMATION - Operations by Segment - Pretax Earnings (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]        
Pretax adjusted earnings $ 1,156 $ 1,061 $ 3,438 $ 3,309
Realized investment gains (losses) [1],[2],[3],[4] (120) 88 (49) 25
Other income (loss) 0 (3) (1) (73)
Earnings before income taxes 1,036 1,146 3,388 3,261
Income taxes applicable to pretax adjusted earnings 293 270 880 862
Effect of foreign currency translation on after tax adjusted earnings 15 (1) 2 27
Aflac Japan        
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]        
Pretax adjusted earnings [2],[4] 838 756 2,504 2,411
Hedge costs 66 59 191 168
Net interest cash flows from derivatives (4)   (18)  
Aflac U.S.        
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]        
Pretax adjusted earnings 335 334 996 1,011
Corporate and other        
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]        
Pretax adjusted earnings [1],[3] (17) (29) (62) (113)
Hedge income 21 9 61 18
Gain (loss) on change in fair value of derivative, interest rate component $ 16 $ 17 $ 50 $ 50
[1] A gain of $16 and $17 for the three-month periods ended September 30, 2019, and 2018, respectively and $50 for both nine-month periods ended September 30, 2019, and 2018, related to the interest rate component of the change in fair value of foreign currency swaps on notes payable have been reclassified from realized investment gains (losses) and included in adjusted earnings when analyzing operations
[2] Amortized hedge costs of $66 and $59 for the three-month periods and $191 and $168 for the nine-month periods ended September 30, 2019, and 2018, respectively, related to certain foreign currency management strategies have been reclassified from realized investment gains (losses) and reported as a deduction from pretax adjusted earnings when analyzing operations.
[3] Amortized hedge income of $21 and $9 for the three-month periods and $61 and $18 for the nine-month periods ended September 30, 2019, and 2018, respectively, related to certain foreign currency management strategies has been reclassified from realized investment gains (losses) and reported as an increase in pretax adjusted earnings when analyzing operations.
[4] Net interest cash flows from derivatives associated with certain investment strategies of $(4) for the three-month period and $(18) for the nine-month period ended September 30, 2019 and an immaterial amount for the three- and nine-month periods in 2018, respectively, have been reclassified from realized investment gains (losses) and included in adjusted earnings as a component of net investment income.