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Schedule II - Aflac Incorporated (Parent Only) - Summary of Notes Payable (Detail 1) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | $ 6,408 | $ 5,765
Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 6,136 | 5,765
Parent Company | 4.00% senior notes due February 2022 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable | [1] | 348 | 348
Parent Company | 3.625% senior notes due June 2023 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 698 | 698
Parent Company | 3.625% senior notes due November 2024 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 747 | 746
Parent Company | 3.25% senior notes due March 2025 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 448 | 447
Parent Company | 2.875% senior notes due October 2026 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 298 | 297
Parent Company | 6.90% senior notes due December 2039 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 220 | 220
Parent Company | 6.45% senior notes due August 2040 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 254 | 254
Parent Company | 4.00% senior notes due October 2046 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 394 | 394
Parent Company | 4.750% senior notes due January 2049 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 541 | 540
Parent Company | .932% senior notes due January 2027 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 545 | 538
Parent Company | .500% senior notes due December 2029 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 114 | 0
Parent Company | 1.159% senior notes due October 2030 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 266 | 262
Parent Company | .843% senior notes due December 2031 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 84 | 0
Parent Company | 1.488% senior notes due October 2033 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 138 | 136
Parent Company | .934% senior notes due December 2034 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 88 | 0
Parent Company | 1.750% senior notes due October 2038 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 81 | 79
Parent Company | 1.122% senior notes due December 2039 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 57 | 0
Parent Company | 2.108% subordinated notes due October 2047 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 543 | 536
Parent Company | Yen-denominated loan variable interest rate due September 2026 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | 45 | 45
Parent Company | Yen-denominated loan variable interest rate due September 2029 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes payable |  | $ 227 | $ 225
[1] | Redeemed in January 2020

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