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Schedule II - Aflac Incorporated (Parent Only) - Summary of Notes Payable (Detail 2)
¥ in Millions, $ in Millions
Dec. 31, 2023
JPY (¥)
Dec. 31, 2022
JPY (¥)
Sep. 30, 2022
JPY (¥)
Aug. 31, 2022
JPY (¥)
Apr. 30, 2021
JPY (¥)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
JPY (¥)
Apr. 30, 2020
USD ($)
Mar. 31, 2020
JPY (¥)
Oct. 31, 2018
JPY (¥)
Oct. 31, 2018
USD ($)
Oct. 31, 2017
JPY (¥)
Jan. 31, 2017
JPY (¥)
Dec. 31, 2016
Sep. 30, 2016
USD ($)
Aug. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
1.125% senior notes due March 2026                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.125% 1.125%       1.125%                      
Debt instrument, principal amount | $           $ 400                      
2.875% senior notes due October 2026                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 2.875% 2.875%                         2.875%    
Debt instrument, principal amount | $                             $ 300    
3.60% senior notes due April 2030                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 3.60% 3.60%           3.60%                  
Debt instrument, principal amount | $               $ 1,000                  
6.90% senior notes due December 2039                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 6.90% 6.90%                       6.90%      
Debt instrument, principal amount | $                                 $ 400
6.45% senior notes due August 2040                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 6.45% 6.45%                       6.45%      
Debt instrument, principal amount | $                               $ 450  
4.00% senior noted due October 2046                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 4.00% 4.00%                         4.00%    
Debt instrument, principal amount | $                             $ 400    
4.750% senior notes due January 2049                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 4.75% 4.75%               4.75% 4.75%            
Debt instrument, principal amount | $                     $ 550            
.300% senior notes due September 2025                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.30% 0.30%             0.30%                
Debt instrument, principal amount ¥ 12,400 ¥ 12,400             ¥ 12,400                
.932% senior notes due January 2027                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.932% 0.932%                     0.932%        
Debt instrument, principal amount ¥ 60,000 ¥ 60,000                     ¥ 60,000        
.500% senior notes due December 2029                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.50% 0.50%         0.50%                    
Debt instrument, principal amount ¥ 12,600 ¥ 12,600         ¥ 12,600                    
.550% senior notes due March 2030                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.55% 0.55%             0.55%                
Debt instrument, principal amount ¥ 13,300 ¥ 13,300             ¥ 13,300                
1.159% senior notes due October 2030                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.159% 1.159%               1.159% 1.159%            
Debt instrument, principal amount ¥ 29,300 ¥ 29,300               ¥ 29,300              
.633% senior notes due April 2031                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.633% 0.633%     0.633%                        
Debt instrument, principal amount ¥ 30,000 ¥ 30,000     ¥ 30,000                        
.843% senior notes due December 2031                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.843% 0.843%         0.843%                    
Debt instrument, principal amount ¥ 9,300 ¥ 9,300         ¥ 9,300                    
.750% senior notes due March 2032                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.75% 0.75%             0.75%                
Debt instrument, principal amount ¥ 20,700 ¥ 20,700             ¥ 20,700                
.844% senior notes due April 2033                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.844% 0.844%     0.844%                        
Debt instrument, principal amount ¥ 12,000 ¥ 12,000     ¥ 12,000                        
1.488% senior notes due October 2033                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.488% 1.488%               1.488% 1.488%            
Debt instrument, principal amount ¥ 15,200 ¥ 15,200               ¥ 15,200              
.934% senior notes due December 2034                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.934% 0.934%         0.934%                    
Debt instrument, principal amount ¥ 9,800 ¥ 9,800         ¥ 9,800                    
.830% senior notes due March 2035                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.83% 0.83%             0.83%                
Debt instrument, principal amount ¥ 10,600 ¥ 10,600             ¥ 10,600                
1.039% senior notes due April 2036                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.039% 1.039%     1.039%                        
Debt instrument, principal amount ¥ 10,000 ¥ 10,000     ¥ 10,000                        
1.750% senior notes due October 2038                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.75% 1.75%               1.75% 1.75%            
Debt instrument, principal amount ¥ 8,900 ¥ 8,900               ¥ 8,900              
1.122% senior notes due December 2039                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.122% 1.122%         1.122%                    
Debt instrument, principal amount ¥ 6,300 ¥ 6,300         ¥ 6,300                    
1.264% senior notes due April 2041                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.264% 1.264%     1.264%                        
Debt instrument, principal amount ¥ 10,000 ¥ 10,000     ¥ 10,000                        
2.108% subordinated notes due October 2047                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 2.108% 2.108%                   2.108%          
Debt instrument, principal amount ¥ 60,000 ¥ 60,000                   ¥ 60,000          
1.560% senior notes due April 2051                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.56% 1.56%     1.56%                        
Debt instrument, principal amount ¥ 20,000 ¥ 20,000     ¥ 20,000                        
1.075% senior notes due September 2029                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.075% 1.075% 1.075%                            
Debt instrument, principal amount ¥ 33,400 ¥ 33,400 ¥ 33,400                            
1.320% senior notes due December 2032                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.32% 1.32% 1.32%                            
Debt instrument, principal amount ¥ 21,100 ¥ 21,100 ¥ 21,100                            
1.594% senior notes due September 2037                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.594% 1.594% 1.594%                            
Debt instrument, principal amount ¥ 6,500 ¥ 6,500 ¥ 6,500                            
2.144% senior notes due September 2052                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 2.144% 2.144% 2.144%                            
Debt instrument, principal amount ¥ 12,000 ¥ 12,000 ¥ 12,000                            
Yen-denominated loan variable interest rate due August 2027                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.35% 0.33%                              
Debt instrument, principal amount ¥ 11,700 ¥ 11,700   ¥ 11,700                          
Yen-denominated loan variable interest rate due August 2029                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.45% 0.43%                              
Debt instrument, principal amount ¥ 25,300 ¥ 25,300   25,300                          
Yen-denominated loan variable interest rate due August 2032                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.60% 0.58%                              
Debt instrument, principal amount ¥ 70,000 ¥ 70,000   ¥ 70,000                          
Parent Company | 1.125% senior notes due March 2026                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.125% 1.125%                              
Parent Company | 2.875% senior notes due October 2026                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 2.875% 2.875%                              
Parent Company | 3.60% senior notes due April 2030                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 3.60% 3.60%                              
Parent Company | 6.90% senior notes due December 2039                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 6.90% 6.90%                              
Parent Company | 6.45% senior notes due August 2040                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 6.45% 6.45%                              
Parent Company | 4.00% senior noted due October 2046                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 4.00% 4.00%                              
Parent Company | 4.750% senior notes due January 2049                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 4.75% 4.75%                              
Parent Company | .300% senior notes due September 2025                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.30% 0.30%                              
Debt instrument, principal amount ¥ 12,400 ¥ 12,400                              
Parent Company | .932% senior notes due January 2027                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.932% 0.932%                              
Debt instrument, principal amount ¥ 60,000 ¥ 60,000                              
Parent Company | .500% senior notes due December 2029                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.50% 0.50%                              
Debt instrument, principal amount ¥ 12,600 ¥ 12,600                              
Parent Company | .550% senior notes due March 2030                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.55% 0.55%                              
Debt instrument, principal amount ¥ 13,300 ¥ 13,300                              
Parent Company | 1.159% senior notes due October 2030                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.159% 1.159%                              
Debt instrument, principal amount ¥ 29,300 ¥ 29,300                              
Parent Company | .633% senior notes due April 2031                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.633% 0.633%                              
Debt instrument, principal amount ¥ 30,000 ¥ 30,000                              
Parent Company | .843% senior notes due December 2031                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.843% 0.843%                              
Debt instrument, principal amount ¥ 9,300 ¥ 9,300                              
Parent Company | .750% senior notes due March 2032                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.75% 0.75%                              
Debt instrument, principal amount ¥ 20,700 ¥ 20,700                              
Parent Company | .844% senior notes due April 2033                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.844% 0.844%                              
Debt instrument, principal amount ¥ 12,000 ¥ 12,000                              
Parent Company | 1.488% senior notes due October 2033                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.488% 1.488%                              
Debt instrument, principal amount ¥ 15,200 ¥ 15,200                              
Parent Company | .934% senior notes due December 2034                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.934% 0.934%                              
Debt instrument, principal amount ¥ 9,800 ¥ 9,800                              
Parent Company | .830% senior notes due March 2035                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.83% 0.83%                              
Debt instrument, principal amount ¥ 10,600 ¥ 10,600                              
Parent Company | 1.039% senior notes due April 2036                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.039% 1.039%                              
Debt instrument, principal amount ¥ 10,000 ¥ 10,000                              
Parent Company | 1.750% senior notes due October 2038                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.75% 1.75%                              
Debt instrument, principal amount ¥ 8,900 ¥ 8,900                              
Parent Company | 1.122% senior notes due December 2039                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.122% 1.122%                              
Debt instrument, principal amount ¥ 6,300 ¥ 6,300                              
Parent Company | 1.264% senior notes due April 2041                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.264% 1.264%                              
Debt instrument, principal amount ¥ 10,000 ¥ 10,000                              
Parent Company | 2.108% subordinated notes due October 2047                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 2.108% 2.108%                              
Debt instrument, principal amount ¥ 60,000 ¥ 60,000                              
Parent Company | 1.560% senior notes due April 2051                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.56% 1.56%                              
Debt instrument, principal amount ¥ 20,000 ¥ 20,000                              
Parent Company | 1.075% senior notes due September 2029                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.075% 1.075%                              
Debt instrument, principal amount ¥ 33,400 ¥ 33,400                              
Parent Company | 1.320% senior notes due December 2032                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.32% 1.32%                              
Debt instrument, principal amount ¥ 21,100 ¥ 21,100                              
Parent Company | 1.594% senior notes due September 2037                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 1.594% 1.594%                              
Debt instrument, principal amount ¥ 6,500 ¥ 6,500                              
Parent Company | 2.144% senior notes due September 2052                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 2.144% 2.144%                              
Debt instrument, principal amount ¥ 12,000 ¥ 12,000                              
Parent Company | Yen-denominated loan variable interest rate due August 2027                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.35% 0.33%                              
Debt instrument, principal amount ¥ 11,700 ¥ 11,700                              
Parent Company | Yen-denominated loan variable interest rate due August 2029                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.45% 0.43%                              
Debt instrument, principal amount ¥ 25,300 ¥ 25,300                              
Parent Company | Yen-denominated loan variable interest rate due August 2032                                  
Condensed Financial Statements, Captions [Line Items]                                  
Debt instrument, interest rate 0.60% 0.58%                              
Debt instrument, principal amount ¥ 70,000 ¥ 70,000