Investments (Fixed Maturity Securities Available-For-Sale by Sector) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 315,474	$ 307,421
Allowance for Credit Loss for Debt Securities	(137)	(160)	$ (113)	$ (184)
Gross Unrealized Gains	5,429	4,981
Gross Unrealized Losses	29,031	31,199
Estimated Fair Value of Fixed Maturity Securities AFS	291,735	281,043
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	87,408	86,315
Allowance for Credit Loss for Debt Securities	(40)	(59)	(15)	(68)
Gross Unrealized Gains	1,402	1,331
Gross Unrealized Losses	7,575	8,213
Estimated Fair Value of Fixed Maturity Securities AFS	81,195	79,374
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	59,798	58,646
Allowance for Credit Loss for Debt Securities	(6)	(18)	(2)	(2)
Gross Unrealized Gains	1,569	1,478
Gross Unrealized Losses	5,834	6,347
Estimated Fair Value of Fixed Maturity Securities AFS	55,527	53,759
Foreign government
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	45,951	44,377
Allowance for Credit Loss for Debt Securities	(57)	(57)	(66)	(88)
Gross Unrealized Gains	1,191	1,256
Gross Unrealized Losses	5,832	5,326
Estimated Fair Value of Fixed Maturity Securities AFS	41,253	40,250
RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	41,371	37,085
Allowance for Credit Loss for Debt Securities	(2)	(1)	(1)	(1)
Gross Unrealized Gains	507	314
Gross Unrealized Losses	2,468	2,977
Estimated Fair Value of Fixed Maturity Securities AFS	39,408	34,421
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	38,531	38,963
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	293	179
Gross Unrealized Losses	4,949	5,714
Estimated Fair Value of Fixed Maturity Securities AFS	33,875	33,428
ABS & CLO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	21,271	20,973
Allowance for Credit Loss for Debt Securities	(7)	(9)	(9)	(7)
Gross Unrealized Gains	203	153
Gross Unrealized Losses	469	526
Estimated Fair Value of Fixed Maturity Securities AFS	20,998	20,591
Municipals
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,131	11,205
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	167	166
Gross Unrealized Losses	1,394	1,498
Estimated Fair Value of Fixed Maturity Securities AFS	9,904	9,873
CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,013	9,857
Allowance for Credit Loss for Debt Securities	(25)	(16)	$ (20)	$ (18)
Gross Unrealized Gains	97	104
Gross Unrealized Losses	510	598
Estimated Fair Value of Fixed Maturity Securities AFS	$ 9,575	$ 9,347