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REINSURANCE Effect of Reinsurance on Premiums and Benefits and Claims (Details) - 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
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct premium income |  |  |  |  |  |  |  |  | $ 19,122 | $ 19,018 | $ 18,875
Ceded premiums |  |  |  |  |  |  |  |  | (547) | (555) | (566)
Assumed premiums earned |  |  |  |  |  |  |  |  | 205 | 214 | 222
Net premium income | $ 4,671 | $ 4,736 | $ 4,681 | $ 4,691 | $ 4,591 | $ 4,636 | $ 4,706 | $ 4,745 | 18,780 | 18,677 | 18,531
Direct benefits and claims |  |  |  |  |  |  |  |  | 12,237 | 12,293 | 12,486
Benefits and claims, net |  |  |  |  |  |  |  |  | 11,942 | 12,000 | 12,181
All other |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ceded premiums |  |  |  |  |  |  |  |  | (69) | (58) | (51)
Assumed premiums earned |  |  |  |  |  |  |  |  | 5 | 6 | 6
Ceded benefits and claims |  |  |  |  |  |  |  |  | (57) | (44) | (44)
Assumed benefits and claims from other companies |  |  |  |  |  |  |  |  | 1 | 2 | 3
Aflac Japan |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premium income |  |  |  |  |  |  |  |  | 12,772 | 12,762 | 12,752
Benefits and claims, net |  |  |  |  |  |  |  |  | 8,877 | 8,913 | 9,087
Aflac Japan | Closed block |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ceded premiums |  |  |  |  |  |  |  |  | (478) | (497) | (515)
Assumed premiums earned |  |  |  |  |  |  |  |  | 200 | 208 | 216
Ceded benefits and claims |  |  |  |  |  |  |  |  | (433) | (450) | (473)
Assumed benefits and claims from other companies |  |  |  |  |  |  |  |  | 194 | 209 | 209
Intercompany eliminations |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ceded benefits and claims |  |  |  |  |  |  |  |  | 41 | 43 | 51
Assumed benefits and claims from other companies |  |  |  |  |  |  |  |  | $ (41) | $ (53) | $ (51)

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