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Schedule II - Aflac Incorporated (Parent Only) - Condensed Statement of Earnings (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
Condensed Income Statements, [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  | $ 886 | $ 936 | $ 878 | $ 878 | $ 874 | $ 870 | $ 862 | $ 837 | $ 3,578 | $ 3,442 | $ 3,220 |
Realized investment gains (losses) |  |  |  |  |  |  |  |  |  | (135) | (430) | (151) |
Total revenues |  | 5,603 | 5,536 | 5,511 | 5,657 | 5,126 | 5,577 | 5,589 | 5,464 | 22,307 | 21,758 | 21,667 |
Interest expense |  |  |  |  |  |  |  |  |  | 228 | 222 | 240 |
Income tax expense (benefit) |  | $ 276 | $ 259 | $ 292 | $ 314 | $ 197 | $ 301 | $ 299 | $ 265 | 1,141 | 1,063 | (586) |
Net earnings |  |  |  |  |  |  |  |  |  | 3,304 | 2,920 | 4,604 |
Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Management and service fees from subsidiaries | [1] |  |  |  |  |  |  |  |  | 151 | 190 | 297 |
Net investment income |  |  |  |  |  |  |  |  |  | 77 | 69 | 30 |
Interest from subsidiaries | [1] |  |  |  |  |  |  |  |  | 4 | 4 | 5 |
Realized investment gains (losses) |  |  |  |  |  |  |  |  |  | 98 | (16) | (1) |
Total revenues |  |  |  |  |  |  |  |  |  | 330 | 247 | 331 |
Interest expense |  |  |  |  |  |  |  |  |  | 200 | 188 | 197 |
Other operating expenses |  |  |  |  |  |  |  |  |  | 221 | 225 | 180 | [2]
Total operating expenses |  |  |  |  |  |  |  |  |  | 421 | 413 | 377 |
Earnings before income taxes and equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  | (91) | (166) | (46) |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (22) | (12) | (23) |
Earnings before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  | (69) | (154) | (23) |
Equity in earnings of subsidiaries | [1] |  |  |  |  |  |  |  |  | 3,373 | 3,074 | 4,627 |
Net earnings |  |  |  |  |  |  |  |  |  | $ 3,304 | $ 2,920 | 4,604 |
5.50% subordinated notes due September 2052 |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expense on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  | $ 13 |
[1] | Eliminated in consolidation
[2] | Includes expense of $13 in 2017 for the early extinguishment of debt

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