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Schedule II - Aflac Incorporated (Parent Only) - Condensed Statements of Comprehensive Income (Loss) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Condensed Financial Statements, Captions [Line Items]      
Net earnings $ 1,964 $ 2,344 $ 1,497
Foreign currency translation adjustments:      
Unrealized foreign currency translation gains (losses) during period - parent only (2) 131 65
Unrealized gains (losses) on investment securities:      
Unrealized holding gains (losses) on investment securities during period - parent only 566 370 (342)
Unrealized gains (losses) on derivatives during period (33) 51 0
Pension liability adjustment during period (65) (32) 22
Total other comprehensive income (loss) before income taxes 1,620 941 962
Income tax expense (benefit) related to items of other comprehensive income (loss) 392 (32) 351
Other comprehensive income (loss), net of income taxes 1,228 973 611
Total comprehensive income (loss) 3,192 3,317 2,108
Parent Company
     
Condensed Financial Statements, Captions [Line Items]      
Net earnings 1,964 2,344 1,497
Foreign currency translation adjustments:      
Unrealized foreign currency translation gains (losses) during period - parent only (54) (127) 72
Equity in unrealized foreign currency translation gains (losses) of subsidiaries during period 52 258 (7)
Unrealized gains (losses) on investment securities:      
Unrealized holding gains (losses) on investment securities during period - parent only 11 7 10
Equity in unrealized holding gains (losses) on investment securities held by subsidiaries during period 555 363 (352)
Equity in reclassification adjustment for realized (gains) losses of subsidiaries included in net earnings 1,154 421 1,217
Unrealized gains (losses) on derivatives during period (33) 51 0
Pension liability adjustment during period (65) (32) 22
Total other comprehensive income (loss) before income taxes 1,620 941 962
Income tax expense (benefit) related to items of other comprehensive income (loss) 392 (32) 351
Other comprehensive income (loss), net of income taxes 1,228 973 611
Total comprehensive income (loss) $ 3,192 $ 3,317 $ 2,108