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Schedule II - Aflac Incorporated (Parent Only) - Condensed Statement of Earnings (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Income Statements, [Line Items]                      
Net investment income $ 813 $ 842 $ 822 $ 801 $ 792 $ 784 $ 777 $ 782 $ 3,278 $ 3,135 $ 3,319
Realized investment gains (losses)                 (123) 140 215
Other income (loss) 227 (2) (21) (25) 19 (10) 19 (1) 179 27 122
Total revenues 5,955 5,716 5,437 5,451 5,319 5,040 5,287 5,226 22,559 20,872 22,728
Interest expense                 268 289 317
Other operating expenses                 344 [1] 392 [1] 178
Earnings before income taxes 1,153 963 834 1,117 1,110 864 874 1,013 4,067 3,862 4,491
Current tax expense (benefit)                 884 1,288 1,079
Deferred tax expense (benefit)                 524 41 461
Total income tax expense $ 402 $ 334 $ 286 $ 386 $ 380 $ 297 $ 301 $ 350 1,408 1,329 1,540
Net earnings                 2,659 2,533 2,951
Parent Company                      
Condensed Income Statements, [Line Items]                      
Dividends from subsidiaries [2]                 2,020 2,393 1,483
Management and service fees from subsidiaries [2]                 265 260 272
Net investment income                 18 22 13
Interest from subsidiaries [2]                 5 6 6
Realized investment gains (losses)                 84 86 45
Change in fair value on the cross-currency interest rate swaps                 (159) (53) 314
Other income (loss)                 0 0 (11)
Total revenues                 2,233 2,714 2,122
Interest expense                 213 231 243
Other operating expenses                 277 [3] 321 [3] 88
Total operating expenses                 490 552 331
Earnings before income taxes                 1,743 2,162 1,791
Current tax expense (benefit)                 3 2 1
Deferred tax expense (benefit)                 (105) (82) 120
Total income tax expense                 (102) (80) 121
Earnings before equity in undistributed earnings of subsidiaries                 1,845 2,242 1,670
Equity in undistributed earnings of subsidiaries [2]                 814 291 1,281
Net earnings                 2,659 2,533 $ 2,951
Senior Notes due 2039 and 2040                      
Condensed Income Statements, [Line Items]                      
Expense on extinguishment of debt                 $ 137    
8.50% senior notes due May 2019                      
Condensed Income Statements, [Line Items]                      
Expense on extinguishment of debt                   $ 230  
[1] Includes expense of $137 in 2016 and $230 in 2015 for the payments associated with the early extinguishment of debt
[2] Eliminated in consolidation
[3] Includes expense of $137 in 2016 and $230 in 2015 for the payments associated with the early extinguishment of debt