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Schedule II - Aflac Incorporated (Parent Only) - Summary of Notes Payable (Detail 2)
$ in Millions, ¥ in Billions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
JPY (¥)
Nov. 30, 2017
Oct. 31, 2017
JPY (¥)
Feb. 28, 2017
Jan. 31, 2017
JPY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
JPY (¥)
Sep. 30, 2016
USD ($)
Sep. 30, 2016
JPY (¥)
Mar. 31, 2015
USD ($)
Nov. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Oct. 31, 2012
USD ($)
Sep. 30, 2012
USD ($)
Jul. 31, 2012
USD ($)
Feb. 29, 2012
USD ($)
Aug. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 5,267           $ 5,339                        
2.65% senior notes paid February 2017                                      
Condensed Financial Statements, Captions [Line Items]                                      
Debt instrument, interest rate         2.65%   2.65% 2.65%               2.65% 2.65%    
Debt instrument, principal amount                               $ 250 $ 400    
2.40% senior notes due March 2020                                      
Condensed Financial Statements, Captions [Line Items]                                      
Debt instrument, interest rate 2.40% 2.40%         2.40% 2.40%     2.40%                
Debt instrument, principal amount $ 550                   $ 550                
4.00% senior notes due February 2022                                      
Condensed Financial Statements, Captions [Line Items]                                      
Debt instrument, interest rate 4.00% 4.00%         4.00% 4.00%                 4.00%    
Debt instrument, principal amount $ 350                               $ 350    
3.625% senior notes due June 2023                                      
Condensed Financial Statements, Captions [Line Items]                                      
Debt instrument, interest rate 3.625% 3.625%         3.625% 3.625%         3.625%            
Debt instrument, principal amount $ 700                       $ 700            
3.625% senior notes due November 2024                                      
Condensed Financial Statements, Captions [Line Items]                                      
Debt instrument, interest rate 3.625% 3.625%         3.625% 3.625%       3.625%              
Debt instrument, principal amount $ 750                     $ 750              
3.25% senior notes due March 2025                                      
Condensed Financial Statements, Captions [Line Items]                                      
Debt instrument, interest rate 3.25% 3.25%         3.25% 3.25%     3.25%                
Debt instrument, principal amount $ 450                   $ 450                
2.875% senior notes due October 2026                                      
Condensed Financial Statements, Captions [Line Items]                                      
Debt instrument, interest rate 2.875% 2.875%         2.875% 2.875% 2.875% 2.875%                  
Debt instrument, principal amount                 $ 300                    
6.90% senior notes due December 2039                                      
Condensed Financial Statements, Captions [Line Items]                                      
Debt instrument, interest rate 6.90% 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% 6.45%                      
Debt instrument, principal amount                                   $ 450  
4.00% senior notes due October 2046                                      
Condensed Financial Statements, Captions [Line Items]                                      
Debt instrument, interest rate 4.00% 4.00%         4.00% 4.00% 4.00% 4.00%                  
Debt instrument, principal amount                 $ 400                    
5.50% subordinated notes due September 2052                                      
Condensed Financial Statements, Captions [Line Items]                                      
Debt instrument, interest rate     5.50%       5.50% 5.50%           5.50% 5.50%        
Debt instrument, principal amount                           $ 50 $ 450        
.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 | ¥   ¥ 60.0       ¥ 60.0                          
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 | ¥   ¥ 60.0   ¥ 60.0                              
Yen-denominated loan variable interest rate due September 2021                                      
Condensed Financial Statements, Captions [Line Items]                                      
Debt instrument, interest rate 0.32% 0.32%         0.31% 0.31%                      
Debt instrument, principal amount | ¥   ¥ 5.0           ¥ 5.0   ¥ 5.0                  
Yen-denominated loan variable interest rate due September 2023                                      
Condensed Financial Statements, Captions [Line Items]                                      
Debt instrument, interest rate 0.47% 0.47%         0.46% 0.46%                      
Debt instrument, principal amount | ¥   ¥ 25.0           ¥ 25.0   ¥ 25.0                  
Parent Company                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 5,267           $ 5,339                        
Parent Company | 2.65% senior notes paid February 2017                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable 0           $ 649                        
Debt instrument, interest rate         2.65%   2.65% 2.65%                      
Parent Company | 2.40% senior notes due March 2020                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 548           $ 547                        
Debt instrument, interest rate 2.40% 2.40%         2.40% 2.40%                      
Parent Company | 4.00% senior notes due February 2022                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 348           $ 348                        
Debt instrument, interest rate 4.00% 4.00%         4.00% 4.00%                      
Parent Company | 3.625% senior notes due June 2023                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 697           $ 696                        
Debt instrument, interest rate 3.625% 3.625%         3.625% 3.625%                      
Parent Company | 3.625% senior notes due November 2024                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 745           $ 745                        
Debt instrument, interest rate 3.625% 3.625%         3.625% 3.625%                      
Parent Company | 3.25% senior notes due March 2025                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 446           $ 445                        
Debt instrument, interest rate 3.25% 3.25%         3.25% 3.25%                      
Parent Company | 2.875% senior notes due October 2026                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 297           $ 298                        
Debt instrument, interest rate 2.875% 2.875%         2.875% 2.875%                      
Parent Company | 6.90% senior notes due December 2039                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 220           $ 220                        
Debt instrument, interest rate 6.90% 6.90%         6.90% 6.90%                      
Parent Company | 6.45% senior notes due August 2040                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 254           $ 254                        
Debt instrument, interest rate 6.45% 6.45%         6.45% 6.45%                      
Parent Company | 4.00% senior notes due October 2046                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 394           $ 394                        
Debt instrument, interest rate 4.00% 4.00%         4.00% 4.00%                      
Parent Company | 5.50% subordinated notes due September 2052                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 0 [1]           $ 486                        
Debt instrument, interest rate     5.50%       5.50% 5.50%                      
Parent Company | .932% senior notes due January 2027                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 528           $ 0                        
Debt instrument, interest rate 0.932% 0.932%       0.932%                          
Debt instrument, principal amount | ¥   ¥ 60.0       ¥ 60.0                          
Parent Company | 2.108% subordinated notes due October 2047                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 526           0                        
Debt instrument, interest rate 2.108% 2.108%   2.108%                              
Debt instrument, principal amount | ¥   ¥ 60.0   ¥ 60.0                              
Parent Company | Yen-denominated loan variable interest rate due September 2021                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 44           $ 43                        
Debt instrument, interest rate 0.32% 0.32%         0.31% 0.31%                      
Debt instrument, principal amount | ¥   ¥ 5.0           ¥ 5.0                      
Parent Company | Yen-denominated loan variable interest rate due September 2023                                      
Condensed Financial Statements, Captions [Line Items]                                      
Notes payable $ 220           $ 214                        
Debt instrument, interest rate 0.47% 0.47%         0.46% 0.46%                      
Debt instrument, principal amount | ¥   ¥ 25.0           ¥ 25.0                      
[1] Redeemed in November 2017