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Schedule II - Aflac Incorporated (Parent Only) - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |  |
Net earnings |  | $ 3,304 | $ 2,920 | $ 4,604
Adjustments to reconcile net earnings to net cash provided from operating activities: |  |  |  |
Other, net |  | 358 | 571 | 150
Net cash provided (used) by operating activities |  | 5,455 | 6,014 | 6,128
Cash flows from investing activities: |  |  |  |
Fixed maturity securities purchased |  | (6,934) | (9,086) | (9,867)
Other investments sold (purchased) |  | (653) | (414) | (206)
Settlement of derivatives |  | (9) | (241) | (621)
Other, net |  | (123) | 176 | (68)
Net cash provided (used) by investing activities |  | (3,171) | (3,582) | (5,431)
Cash flows from financing activities: |  |  |  |
Purchases of treasury stock |  | (1,627) | (1,301) | (1,351)
Proceeds from borrowings |  | 615 | 1,020 | 1,040
Principal payments under debt obligations |  | 0 | (550) | (1,161)
Dividends paid to shareholders |  | (771) | (793) | (661)
Treasury stock reissued |  | 49 | 58 | 33
Proceeds from exercise of stock options |  | 40 | 48 | 58
Other, net |  | 22 | (19) | 0
Net cash provided (used) by financing activities |  | (1,713) | (1,616) | (2,065)
Net change in cash and cash equivalents |  | 559 | 846 | (1,368)
Cash and cash equivalents, beginning of period |  | 4,337 | 3,491 | 4,859
Cash and cash equivalents, end of period |  | 4,896 | 4,337 | 3,491
Parent Company |  |  |  |
Cash flows from operating activities: |  |  |  |
Net earnings |  | 3,304 | 2,920 | 4,604
Adjustments to reconcile net earnings to net cash provided from operating activities: |  |  |  |
Equity in earnings of subsidiaries | [1] | (3,373) | (3,074) | (4,627)
Cash dividends received from subsidiaries |  | 3,466 | 1,820 | 2,001
Other, net |  | (203) | 99 | (46)
Net cash provided (used) by operating activities |  | 3,194 | 1,765 | 1,932
Cash flows from investing activities: |  |  |  |
Fixed maturity securities sold |  | 340 | 207 | 263
Fixed maturity securities purchased |  | (639) | (254) | (329)
Other investments sold (purchased) |  | (16) | 31 | (47)
Settlement of derivatives |  | 22 | (2) | 223
Additional capitalization of subsidiaries | [1] | (214) | (62) | (69)
Other, net |  | 87 | (107) | (218)
Net cash provided (used) by investing activities |  | (420) | (187) | (177)
Cash flows from financing activities: |  |  |  |
Purchases of treasury stock |  | (1,627) | (1,301) | (1,351)
Proceeds from borrowings |  | 347 | 1,020 | 1,040
Principal payments under debt obligations |  | 0 | (550) | (1,161)
Dividends paid to shareholders |  | (771) | (793) | (661)
Treasury stock reissued |  | 49 | 58 | 33
Proceeds from exercise of stock options |  | 29 | 34 | 38
Net change in amount due to/from subsidiary | [1] | (58) | (4) | (5)
Other, net |  | (2) | 0 | 0
Net cash provided (used) by financing activities |  | (2,033) | (1,536) | (2,067)
Net change in cash and cash equivalents |  | 741 | 42 | (312)
Cash and cash equivalents, beginning of period |  | 1,767 | 1,725 | 2,037
Cash and cash equivalents, end of period |  | $ 2,508 | $ 1,767 | $ 1,725
[1] | Eliminated in consolidation

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