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SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION - (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs | $ 10,128 |  |  |  | $ 9,875 |  |  |  | $ 10,128 | $ 9,875 |
Future policy benefits & unpaid policy claims | 94,994 |  |  |  | 90,952 |  |  |  | 94,994 | 90,952 |
Unearned premiums | 4,243 |  |  |  | 5,090 |  |  |  | 4,243 | 5,090 |
Other policyholders' funds | 7,317 |  |  |  | 7,146 |  |  |  | 7,317 | 7,146 |
Premiums Earned, Net | 4,671 | $ 4,736 | $ 4,681 | $ 4,691 | 4,591 | $ 4,636 | $ 4,706 | $ 4,745 | 18,780 | 18,677 | $ 18,531
Net investment income | 886 | $ 936 | $ 878 | $ 878 | 874 | $ 870 | $ 862 | $ 837 | 3,578 | 3,442 | 3,220
Benefits and claims, net |  |  |  |  |  |  |  |  | 11,942 | 12,000 | 12,181
Amortization of deferred policy acquisition costs |  |  |  |  |  |  |  |  | 1,282 | 1,245 | 1,132
Other operating expenses |  |  |  |  |  |  |  |  | 4,638 | 4,530 | 4,336
Premiums written |  |  |  |  |  |  |  |  | 18,180 | 18,005 | 17,657
Aflac Japan |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs | 6,584 |  |  |  | 6,384 |  |  |  | 6,584 | 6,384 | 6,150
Future policy benefits & unpaid policy claims | 84,341 |  |  |  | 80,672 |  |  |  | 84,341 | 80,672 |
Unearned premiums | 4,135 |  |  |  | 4,977 |  |  |  | 4,135 | 4,977 |
Other policyholders' funds | 7,317 |  |  |  | 7,145 |  |  |  | 7,317 | 7,145 |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 12,772 | 12,762 | 12,752
Net investment income |  |  |  |  |  |  |  |  | 2,753 | 2,639 | 2,463
Benefits and claims, net |  |  |  |  |  |  |  |  | 8,877 | 8,913 | 9,087
Amortization of deferred policy acquisition costs |  |  |  |  |  |  |  |  | 709 | 710 | 630
Other operating expenses |  |  |  |  |  |  |  |  | 2,465 | 2,374 | 2,257
Premiums written |  |  |  |  |  |  |  |  | 12,367 | 12,298 | 12,092
Aflac U.S. |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs | 3,544 |  |  |  | 3,491 |  |  |  | 3,544 | 3,491 | 3,355
Future policy benefits & unpaid policy claims | 11,184 |  |  |  | 10,864 |  |  |  | 11,184 | 10,864 |
Unearned premiums | 111 |  |  |  | 117 |  |  |  | 111 | 117 |
Other policyholders' funds | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 5,808 | 5,708 | 5,563
Net investment income |  |  |  |  |  |  |  |  | 720 | 727 | 721
Benefits and claims, net |  |  |  |  |  |  |  |  | 2,871 | 2,887 | 2,885
Amortization of deferred policy acquisition costs |  |  |  |  |  |  |  |  | 573 | 534 | 502
Other operating expenses |  |  |  |  |  |  |  |  | 1,834 | 1,736 | 1,658
Premiums written |  |  |  |  |  |  |  |  | 5,813 | 5,707 | 5,565
All other |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Future policy benefits & unpaid policy claims | 223 |  |  |  | 183 |  |  |  | 223 | 183 |
Unearned premiums | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Other policyholders' funds | 0 |  |  |  | 1 |  |  |  | 0 | 1 |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 200 | 207 | 216
Net investment income |  |  |  |  |  |  |  |  | 105 | 76 | 36
Benefits and claims, net |  |  |  |  |  |  |  |  | 194 | 200 | 209
Amortization of deferred policy acquisition costs |  |  |  |  |  |  |  |  | 0 | 1 | 0
Other operating expenses |  |  |  |  |  |  |  |  | 339 | 420 | 421
Premiums written |  |  |  |  |  |  |  |  | 0 | 0 | $ 0
Intercompany eliminations |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Future policy benefits & unpaid policy claims | (754) |  |  |  | (767) |  |  |  | (754) | (767) |
Unearned premiums | (3) |  |  |  | (4) |  |  |  | (3) | (4) |
Other policyholders' funds | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |

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