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NOTES PAYABLE AND LEASE OBLIGATIONS - Summary of Lines of Credit (Detail) - 12 months ended Dec. 31, 2023 ¥ in Millions, $ in Millions | USD ($) | JPY (¥)
--- | --- | ---
$100 million line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | The rate quoted by the bank and agreed upon at the time of borrowing |
Line of credit facility term | 364 days |
Line of credit facility, maximum borrowing capacity | $ 100.0 |
Line of credit facility, amount outstanding | $ 0.0 |
100.0 billion yen line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | A rate per annum equal to (a) Tokyo Interbank Market Rate (TIBOR) plus, the alternative applicable TIBOR margin during the availability period from the closing date to the commitment termination date or (b) the TIBOR rate offered by the agent to major banks in yen for the applicable period plus, the applicable alternative TIBOR margin during the term out period |
Line of credit facility term | 5 years |
Line of credit facility, maximum borrowing capacity | ¥ |  | ¥ 100,000
Line of credit facility, amount outstanding | ¥ |  | 0
$1.0 billion line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | A rate per annum equal to, at the Company's option, either, (a) Secured Overnight Financing Rate (SOFR) for U.S. dollar denominated borrowings or TIBOR for Japanese yen denominated borrowings, in either case adjusted for certain costs, or (b) a base rate determined by reference to the highest of (1) the federal funds rate plus 1/2 of 1%, (2) the rate of interest for such day announced by the agent as its prime rate, or (3) SOFR for an interest period of one month plus 1.00%, in each case plus an applicable margin |
Line of credit facility term | 5 years |
Line of credit facility, maximum borrowing capacity | $ 1,000.0 |
Line of credit facility, amount outstanding | $ 0.0 |
$50 million line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | A rate per annum equal to, at the Parent Company's option, either (a) a rate determined by reference to SOFR for the interest period relevant to such borrowing or (b) the base rate determined by reference to the highest of (1) the lender's USD short-term commercial loan rate and (2) the federal funds rate plus 1/2 of 1% |
Line of credit facility, maximum borrowing capacity | $ 50.0 |
Line of credit facility, amount outstanding | $ 0.0 |
$250 million line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | Three-month term SOFR plus a 10 basis point SOFR adjustment and an additional 75 basis points per annum |
Line of credit facility term | 364 days |
Line of credit facility, maximum borrowing capacity | $ 250.0 |
Line of credit facility, amount outstanding | $ 75.0 |
50.0 billion yen line of credit (Tranche 1) |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | Three-month yen TIBOR plus 75 basis points per annum |
Line of credit facility term | 364 days |
Line of credit facility, maximum borrowing capacity | ¥ |  | 50,000
Line of credit facility, amount outstanding | ¥ |  | 0
50.0 billion yen line of credit (Tranche 2) |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | Three-month yen TIBOR plus 75 basis points per annum |
Line of credit facility term | 364 days |
Line of credit facility, maximum borrowing capacity | ¥ |  | 50,000
Line of credit facility, amount outstanding | ¥ |  | 0
$25 million line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | Three-month term SOFR plus a 10 basis point SOFR adjustment and an additional 75 basis points per annum |
Line of credit facility term | 364 days |
Line of credit facility, maximum borrowing capacity | $ 25.0 |
Line of credit facility, amount outstanding | $ 0.0 |
$15 million line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | Three-month term SOFR plus a 10 basis point SOFR adjustment and an additional 75 basis points per annum |
Line of credit facility term | 364 days |
Line of credit facility, maximum borrowing capacity | $ 15.0 |
Line of credit facility, amount outstanding | $ 0.0 |
$300 thousand line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | Three-month term SOFR plus a 10 basis point SOFR adjustment and an additional 75 basis points per annum |
Line of credit facility term | 364 days |
Line of credit facility, maximum borrowing capacity | $ 0.3 |
Line of credit facility, amount outstanding | $ 0.0 |
Nine hundred million yen line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | A rate per annum equal to the short-term prime lending rates of banks appearing on the website for the Bank of Japan on the first day of the applicable period |
Line of credit facility term | 364 days |
Line of credit facility, maximum borrowing capacity | ¥ |  | 900
Line of credit facility, amount outstanding | ¥ |  | 0
Six hundred million yen line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | A rate per annum equal to the short-term prime lending rates of banks appearing on the website for the Bank of Japan on the first day of the applicable period |
Line of credit facility term | 364 days |
Line of credit facility, maximum borrowing capacity | ¥ |  | 600
Line of credit facility, amount outstanding | ¥ |  | ¥ 0
$30 million line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | Three-month term SOFR plus a 10 basis point SOFR adjustment and an additional 75 basis points per annum |
Line of credit facility term | 364 days |
Line of credit facility, maximum borrowing capacity | $ 30.0 |
Line of credit facility, amount outstanding | $ 0.0 |
$400 million line of credit (Aflac Incorporated as borrower) |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | Three-month term SOFR plus a 10 basis point SOFR adjustment and an additional 97 basis points per annum for U.S. dollar denominated borrowings or three-month TIBOR plus 97 basis points per annum for Japanese yen denominated borrowings |
Line of credit facility term | 364 days |
Line of credit facility, maximum borrowing capacity | $ 400.0 |
Line of credit facility, amount outstanding | $ 0.0 |
$400 million line of credit (Aflac Re Bermuda Ltd. as borrower) |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, interest rate description | Three-month term SOFR plus a 10 basis point SOFR adjustment and an additional 68 basis points per annum for U.S. dollar denominated borrowings or three-month TIBOR plus 68 basis points per annum for Japanese yen denominated borrowings |
Line of credit facility term | 364 days |
Line of credit facility, maximum borrowing capacity | $ 400.0 |
Line of credit facility, amount outstanding | $ 0.0 |
Lower Limit | 100.0 billion yen line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, commitment fee percentage | 0.28% |
Lower Limit | $1.0 billion line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, commitment fee percentage | 0.08% |
Upper Limit | $100 million line of credit |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, term | 3 months |
Upper Limit | 100.0 billion yen line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, commitment fee percentage | 0.45% |
Upper Limit | $1.0 billion line of credit |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, commitment fee percentage | 0.20% |
Upper Limit | $50 million line of credit |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, term | 3 months |

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