Investments (Fixed Maturity Securities Available-For-Sale by Sector) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 321,735		$ 307,421
Allowance for Credit Loss for Debt Securities	(151)	$ (137)	(160)	$ (121)	$ (113)	$ (184)
Gross Unrealized Gains	6,229		4,981
Gross Unrealized Losses	29,076		31,199
Estimated Fair Value of Fixed Maturity Securities AFS	298,737		281,043
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	88,484		86,315
Allowance for Credit Loss for Debt Securities	(62)	(40)	(59)	(37)	(15)	(68)
Gross Unrealized Gains	1,509		1,331
Gross Unrealized Losses	7,398		8,213
Estimated Fair Value of Fixed Maturity Securities AFS	82,533		79,374
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	61,640		58,646
Allowance for Credit Loss for Debt Securities	0	(6)	(18)	(2)	(2)	(2)
Gross Unrealized Gains	2,201		1,478
Gross Unrealized Losses	4,598		6,347
Estimated Fair Value of Fixed Maturity Securities AFS	59,243		53,759
Foreign government
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	47,874		44,377
Allowance for Credit Loss for Debt Securities	(57)	(57)	(57)	(58)	(66)	(88)
Gross Unrealized Gains	1,216		1,256
Gross Unrealized Losses	6,551		5,326
Estimated Fair Value of Fixed Maturity Securities AFS	42,482		40,250
RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	43,004		37,085
Allowance for Credit Loss for Debt Securities	(2)	(2)	(1)	(1)	(1)	(1)
Gross Unrealized Gains	526		314
Gross Unrealized Losses	2,453		2,977
Estimated Fair Value of Fixed Maturity Securities AFS	41,075		34,421
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	38,002		38,963
Allowance for Credit Loss for Debt Securities	0		0
Gross Unrealized Gains	279		179
Gross Unrealized Losses	5,655		5,714
Estimated Fair Value of Fixed Maturity Securities AFS	32,626		33,428
ABS & CLO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	21,409		20,973
Allowance for Credit Loss for Debt Securities	(5)	(7)	(9)	(9)	(9)	(7)
Gross Unrealized Gains	253		153
Gross Unrealized Losses	433		526
Estimated Fair Value of Fixed Maturity Securities AFS	21,224		20,591
Municipals
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,314		11,205
Allowance for Credit Loss for Debt Securities	0		0
Gross Unrealized Gains	138		166
Gross Unrealized Losses	1,515		1,498
Estimated Fair Value of Fixed Maturity Securities AFS	9,937		9,873
CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,008		9,857
Allowance for Credit Loss for Debt Securities	(25)	$ (25)	(16)	$ (14)	$ (20)	$ (18)
Gross Unrealized Gains	107		104
Gross Unrealized Losses	473		598
Estimated Fair Value of Fixed Maturity Securities AFS	$ 9,617		$ 9,347