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Schedule II - Aflac Incorporated (Parent Only) - Summary of Notes Payable and Lease Obligations (Detail 1) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |
Operating lease obligations | $ 91 | $ 118
Notes payable and lease obligations | 7,498 | 7,364
1.125% senior notes due March 2026 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 399 | 398
2.875% senior notes due October 2026 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 299 | 299
3.60% senior notes due April 2030 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 994 | 993
6.90% senior notes due December 2039 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 221 | 221
6.45% senior notes due August 2040 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 255 | 254
4.00% senior noted due October 2046 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 394 | 394
4.750% senior notes due January 2049 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 542 | 542
.300% senior notes due September 2025 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 79 | 87
.932% senior notes due January 2027 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 378 | 422
1.048% senior notes due March 2039 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 81 | 0
1.075% senior notes due September 2029 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 211 | 234
.500% senior notes due December 2029 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 79 | 88
.550% senior notes due March 2030 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 84 | 93
1.159% senior notes due October 2030 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 184 | 206
1.412% senior notes due March 2031 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 176 | 0
.633% senior notes due April 2031 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 189 | 211
.843% senior notes due December 2031 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 58 | 65
.750% senior notes due March 2032 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 130 | 145
1.320% senior notes due December 2032 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 133 | 148
.844% senior notes due April 2033 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 76 | 84
1.488% senior notes due October 2033 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 95 | 106
1.682% senior notes due March 2034 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 48 | 0
1.600% senior notes due March 2034 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 115 | 0
.934% senior notes due December 2034 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 62 | 69
.830% senior notes due March 2035 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 66 | 74
1.740% senior notes due March 2036 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 94 | 0
1.039% senior notes due April 2036 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 63 | 70
1.594% senior notes due September 2037 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 41 | 45
1.750% senior notes due October 2038 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 56 | 62
1.920% senior notes due March 2039 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 103 | 0
1.122% senior notes due December 2039 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 39 | 44
1.264% senior notes due April 2041 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 63 | 70
2.160% senior notes due March 2044 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 35 | 0
2.108% subordinated notes due October 2047 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 375 | 419
1.560% senior notes due April 2051 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 125 | 140
2.144% senior notes due September 2052 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 75 | 84
2.400% senior notes due March 2054 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 122 | 0
Yen-denominated loan variable interest rate due August 2027 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 74 | 82
Yen-denominated loan variable interest rate due August 2029 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 160 | 178
Yen-denominated loan variable interest rate due August 2032 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 441 | 492
Parent Company |  |
Condensed Financial Statements, Captions [Line Items] |  |
Operating lease obligations | 5 | 0
Notes payable and lease obligations | 7,219 | 6,819
Parent Company | 1.125% senior notes due March 2026 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 399 | 398
Parent Company | 2.875% senior notes due October 2026 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 299 | 299
Parent Company | 3.60% senior notes due April 2030 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 994 | 993
Parent Company | 6.90% senior notes due December 2039 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 221 | 221
Parent Company | 6.45% senior notes due August 2040 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 255 | 254
Parent Company | 4.00% senior noted due October 2046 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 394 | 394
Parent Company | 4.750% senior notes due January 2049 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 542 | 542
Parent Company | .300% senior notes due September 2025 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 79 | 87
Parent Company | .932% senior notes due January 2027 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 378 | 422
Parent Company | 1.048% senior notes due March 2039 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 81 | 0
Parent Company | 1.075% senior notes due September 2029 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 211 | 234
Parent Company | .500% senior notes due December 2029 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 79 | 88
Parent Company | .550% senior notes due March 2030 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 84 | 93
Parent Company | 1.159% senior notes due October 2030 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 184 | 206
Parent Company | 1.412% senior notes due March 2031 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 176 | 0
Parent Company | .633% senior notes due April 2031 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 189 | 211
Parent Company | .843% senior notes due December 2031 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 58 | 65
Parent Company | .750% senior notes due March 2032 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 130 | 145
Parent Company | 1.320% senior notes due December 2032 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 133 | 148
Parent Company | .844% senior notes due April 2033 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 76 | 84
Parent Company | 1.488% senior notes due October 2033 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 95 | 106
Parent Company | 1.682% senior notes due March 2034 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 48 | 0
Parent Company | 1.600% senior notes due March 2034 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 115 | 0
Parent Company | .934% senior notes due December 2034 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 62 | 69
Parent Company | .830% senior notes due March 2035 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 66 | 74
Parent Company | 1.740% senior notes due March 2036 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 94 | 0
Parent Company | 1.039% senior notes due April 2036 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 63 | 70
Parent Company | 1.594% senior notes due September 2037 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 41 | 45
Parent Company | 1.750% senior notes due October 2038 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 56 | 62
Parent Company | 1.920% senior notes due March 2039 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 103 | 0
Parent Company | 1.122% senior notes due December 2039 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 39 | 44
Parent Company | 1.264% senior notes due April 2041 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 63 | 70
Parent Company | 2.160% senior notes due March 2044 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 35 | 0
Parent Company | 2.108% subordinated notes due October 2047 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 375 | 419
Parent Company | 1.560% senior notes due April 2051 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 125 | 140
Parent Company | 2.144% senior notes due September 2052 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 75 | 84
Parent Company | 2.400% senior notes due March 2054 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 122 | 0
Parent Company | Yen-denominated loan variable interest rate due August 2027 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 74 | 82
Parent Company | Yen-denominated loan variable interest rate due August 2029 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | 160 | 178
Parent Company | Yen-denominated loan variable interest rate due August 2032 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Notes payable and lease obligations | $ 441 | $ 492

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