NOTES PAYABLE AND LEASE OBLIGATIONS - Summary of Notes Payable (Detail 1) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Notes payable and lease obligations	$ 8,933	$ 7,498
Finance lease obligations	5	5
Operating lease obligations	91	91
1.125% senior sustainability notes due March 2026
Debt Instrument [Line Items]
Notes payable and lease obligations	399	399
2.875% senior notes due October 2026
Debt Instrument [Line Items]
Notes payable and lease obligations	299	299
3.60% senior notes due April 2030
Debt Instrument [Line Items]
Notes payable and lease obligations	994	994
6.90% senior notes due December 2039
Debt Instrument [Line Items]
Notes payable and lease obligations	221	221
6.45% senior notes due August 2040
Debt Instrument [Line Items]
Notes payable and lease obligations	255	255
4.00% senior notes due October 2046
Debt Instrument [Line Items]
Notes payable and lease obligations	394	394
4.750% senior notes due January 2049
Debt Instrument [Line Items]
Notes payable and lease obligations	542	542
.300% senior notes due September 2025
Debt Instrument [Line Items]
Notes payable and lease obligations	86	79
.932% senior notes due January 2027
Debt Instrument [Line Items]
Notes payable and lease obligations	413	378
1.048% senior notes due March 2029
Debt Instrument [Line Items]
Notes payable and lease obligations	89	81
1.075% senior notes due September 2029
Debt Instrument [Line Items]
Notes payable and lease obligations	230	211
.500% senior notes due December 2029
Debt Instrument [Line Items]
Notes payable and lease obligations	87	79
.550% senior notes due March 2030
Debt Instrument [Line Items]
Notes payable and lease obligations	91	84
1.159% senior notes due October 2030
Debt Instrument [Line Items]
Notes payable and lease obligations	201	184
1.726% senior notes due October 2030
Debt Instrument [Line Items]
Notes payable and lease obligations	241	0
1.412% senior notes due March 2031
Debt Instrument [Line Items]
Notes payable and lease obligations	192	176
.633% senior notes due April 2031
Debt Instrument [Line Items]
Notes payable and lease obligations	207	189
.843% senior notes due December 2031
Debt Instrument [Line Items]
Notes payable and lease obligations	64	58
.750% senior notes due March 2032
Debt Instrument [Line Items]
Notes payable and lease obligations	142	130
1.990% senior notes due May 2032
Debt Instrument [Line Items]
Notes payable and lease obligations	126	0
1.320% senior notes due December 2032
Debt Instrument [Line Items]
Notes payable and lease obligations	145	133
2.003% senior notes due December 2032
Debt Instrument [Line Items]
Notes payable and lease obligations	161	0
.844% senior notes due April 2033
Debt Instrument [Line Items]
Notes payable and lease obligations	83	76
1.488% senior notes due October 2033
Debt Instrument [Line Items]
Notes payable and lease obligations	104	95
1.682% senior notes due March 2034
Debt Instrument [Line Items]
Notes payable and lease obligations	53	48
1.600% senior notes due March 2034
Debt Instrument [Line Items]
Notes payable and lease obligations	126	115
.934% senior notes due December 2034
Debt Instrument [Line Items]
Notes payable and lease obligations	67	62
.830% senior notes due March 2035
Debt Instrument [Line Items]
Notes payable and lease obligations	73	66
2.320% senior notes due May 2035
Debt Instrument [Line Items]
Notes payable and lease obligations	264	0
2.369% senior notes due June 2035
Debt Instrument [Line Items]
Notes payable and lease obligations	65	0
1.740% senior notes due March 2036
Debt Instrument [Line Items]
Notes payable and lease obligations	102	94
1.039% senior notes due April 2036
Debt Instrument [Line Items]
Notes payable and lease obligations	69	63
1.594% senior notes due September 2037
Debt Instrument [Line Items]
Notes payable and lease obligations	45	41
1.750% senior notes due October 2038
Debt Instrument [Line Items]
Notes payable and lease obligations	61	56
1.920% senior notes due March 2039
Debt Instrument [Line Items]
Notes payable and lease obligations	113	103
1.122% senior notes due December 2039
Debt Instrument [Line Items]
Notes payable and lease obligations	43	39
2.650% senior notes due May 2040
Debt Instrument [Line Items]
Notes payable and lease obligations	80	0
2.779% senior notes due June 2040
Debt Instrument [Line Items]
Notes payable and lease obligations	48	0
1.264% senior notes due April 2041
Debt Instrument [Line Items]
Notes payable and lease obligations	69	63
2.160% senior notes due March 2044
Debt Instrument [Line Items]
Notes payable and lease obligations	39	35
3.040% senior notes due May 2045
Debt Instrument [Line Items]
Notes payable and lease obligations	48	0
2.108% subordinated notes due October 2047
Debt Instrument [Line Items]
Notes payable and lease obligations	410	375
1.560% senior notes due April 2051
Debt Instrument [Line Items]
Notes payable and lease obligations	137	125
2.144% senior notes due September 2052
Debt Instrument [Line Items]
Notes payable and lease obligations	82	75
1.958% subordinated bonds due December 2053
Debt Instrument [Line Items]
Notes payable and lease obligations	206	188
2.400% senior notes due March 2054
Debt Instrument [Line Items]
Notes payable and lease obligations	134	122
Yen-denominated loan variable interest rate due August 2027
Debt Instrument [Line Items]
Notes payable and lease obligations	81	74
Yen-denominated loan variable interest rate due August 2029
Debt Instrument [Line Items]
Notes payable and lease obligations	174	160
Yen-denominated loan variable interest rate due August 2032
Debt Instrument [Line Items]
Notes payable and lease obligations	$ 482	$ 441

AFLAC INC 10-Q