Investments - Schedule of AFS Securities (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	$ 231,743	$ 228,544
AFS securities allowance for credit losses	(744)	(758)	$ (709)	$ (709)
Gross Unrealized Gains	2,707	3,572
Gross Unrealized Losses	(13,915)	(12,317)
Available-for-sale securities	219,791	219,041
Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	202,108	202,116
AFS securities allowance for credit losses	(743)	(757)	(708)	(708)
Gross Unrealized Gains	2,561	3,330
Gross Unrealized Losses	(13,550)	(12,092)
Available-for-sale securities	190,376	192,597
Related Party
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	29,635	26,428
AFS securities allowance for credit losses	(1)	(1)
Gross Unrealized Gains	146	242
Gross Unrealized Losses	(365)	(225)
Available-for-sale securities	29,415	26,444
U.S. government and agencies \| Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	20,138	18,008
AFS securities allowance for credit losses	0	0
Gross Unrealized Gains	50	116
Gross Unrealized Losses	(1,389)	(1,226)
Available-for-sale securities	18,799	16,898
US States and Political Subdivisions Debt Securities \| Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	942	954
AFS securities allowance for credit losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(195)	(195)
Available-for-sale securities	747	759
Foreign governments \| Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	2,316	2,225
AFS securities allowance for credit losses	0	0
Gross Unrealized Gains	24	32
Gross Unrealized Losses	(668)	(598)
Available-for-sale securities	1,672	1,659
Corporate \| Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	95,501	97,166
AFS securities allowance for credit losses	(56)	(105)	(174)	(175)
Gross Unrealized Gains	649	1,291
Gross Unrealized Losses	(10,041)	(8,921)
Available-for-sale securities	86,053	89,431
Corporate \| Related Party
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	3,794	2,663
AFS securities allowance for credit losses	0	0
Gross Unrealized Gains	38	76
Gross Unrealized Losses	(101)	(25)
Available-for-sale securities	3,731	2,714
CLO \| Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	23,415	25,730
AFS securities allowance for credit losses	0	0
Gross Unrealized Gains	436	648
Gross Unrealized Losses	(157)	(106)
Available-for-sale securities	23,694	26,272
CLO \| Related Party
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	6,766	7,103
AFS securities allowance for credit losses	0	0
Gross Unrealized Gains	78	121
Gross Unrealized Losses	(46)	(21)
Available-for-sale securities	6,798	7,203
ABS \| Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	38,062	35,275
AFS securities allowance for credit losses	(179)	(171)	(82)	(76)
Gross Unrealized Gains	1,101	823
Gross Unrealized Losses	(494)	(465)
Available-for-sale securities	38,490	35,462
ABS \| Related Party
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	18,922	16,500
AFS securities allowance for credit losses	(1)	(1)	(1)	(1)
Gross Unrealized Gains	30	45
Gross Unrealized Losses	(218)	(178)
Available-for-sale securities	18,733	16,366
CMBS \| Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	12,996	13,351
AFS securities allowance for credit losses	(91)	(70)	(60)	(60)
Gross Unrealized Gains	66	120
Gross Unrealized Losses	(328)	(317)
Available-for-sale securities	12,643	13,084
CMBS \| Related Party
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	153	162
AFS securities allowance for credit losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Available-for-sale securities	153	161
RMBS \| Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities	8,738	9,407
AFS securities allowance for credit losses	(417)	(411)	$ (392)	$ (397)
Gross Unrealized Gains	235	300
Gross Unrealized Losses	(278)	(264)
Available-for-sale securities	$ 8,278	$ 9,032

Athene Holding Ltd. 10-Q