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Schedule II - Aflac Incorporated (Parent Only) - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities: |  |  |  |
Net earnings |  | $ 4,659 | $ 4,418 | $ 4,231
Adjustments to reconcile net earnings to net cash provided from operating activities: |  |  |  |
Other, net |  | 1,043 | (136) | 574
Net cash provided (used) by operating activities |  | 3,190 | 3,879 | 5,051
Cash flows from investing activities: |  |  |  |
Fixed maturity securities purchased |  | (2,801) | (3,514) | (5,813)
Other investments sold (purchased) |  | (417) | (227) | (1,066)
Settlement of derivatives |  | 79 | (61) | 199
Other, net |  | (149) | 112 | 41
Net cash provided (used) by investing activities |  | 817 | (1,540) | (2,378)
Cash flows from financing activities: |  |  |  |
Purchases of treasury stock |  | (2,801) | (2,401) | (2,301)
Proceeds from borrowings |  | 204 | 1,277 | 1,153
Principal payments under debt obligations |  | 0 | (1,416) | (700)
Dividends paid to shareholders |  | (966) | (979) | (855)
Treasury stock reissued |  | 17 | 17 | 26
Proceeds from exercise of stock options |  | 16 | 16 | 26
Other, net |  | (17) | 34 | (26)
Net cash provided (used) by financing activities |  | (3,723) | (3,551) | (2,739)
Net change in cash and cash equivalents |  | 363 | (1,108) | (90)
Cash and cash equivalents, beginning of period |  | 3,943 |  |
Cash and cash equivalents, end of period |  | 4,306 | 3,943 |
Parent Company |  |  |  |
Cash flows from operating activities: |  |  |  |
Net earnings |  | 4,659 | 4,418 | 4,231
Adjustments to reconcile net earnings to net cash provided from operating activities: |  |  |  |
Equity in earnings of subsidiaries | [1] | (4,418) | (4,787) | (4,364)
Cash dividends received from subsidiaries |  | 3,410 | 2,705 | 2,791
Other, net |  | (686) | 18 | 408
Net cash provided (used) by operating activities |  | 2,965 | 2,354 | 3,066
Cash flows from investing activities: |  |  |  |
Fixed maturity securities sold |  | 547 | 392 | 483
Fixed maturity securities purchased |  | (345) | (438) | (489)
Other investments sold (purchased) |  | (34) | (206) | (421)
Settlement of derivatives |  | 693 | 718 | 135
Additional capitalization of subsidiaries | [1] | (203) | (294) | (161)
Other, net |  | 1 | 1 | 1
Net cash provided (used) by investing activities |  | 659 | 173 | (452)
Cash flows from financing activities: |  |  |  |
Purchases of treasury stock |  | (2,801) | (2,401) | (2,301)
Proceeds from borrowings |  | 0 | 1,277 | 1,153
Principal payments under debt obligations |  | 0 | (1,416) | (700)
Dividends paid to shareholders |  | (966) | (979) | (855)
Treasury stock reissued |  | 17 | 17 | 26
Proceeds from exercise of stock options |  | 13 | 12 | 17
Net change in amount due to/from subsidiary | [1] | (6) | 16 | 43
Other, net |  | (17) | (7) | (26)
Net cash provided (used) by financing activities |  | (3,760) | (3,481) | (2,643)
Net change in cash and cash equivalents |  | (136) | (954) | (29)
Cash and cash equivalents, beginning of period |  | 1,143 | 2,097 | 2,126
Cash and cash equivalents, end of period |  | $ 1,007 | $ 1,143 | $ 2,097
[1] | Eliminated in consolidation

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