Disposition - Schedule of Major Classes of Assets and Liabilities Classified as Held for Sale (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Investments
Total assets held for sale	$ 3,786	$ 3,092
Liabilities
Total liabilities held for sale	2,375	2,113
Disposal Group, Held-for-Sale, Not Discontinued Operations | EVB
Investments
Fixed income securities, at fair value (amortized cost, net $1,764, $208, $1,972 and $1,809)	1,676	1,699
Short-term, at fair value (amortized cost $64, $13, $77 and $85)	64	85
Other investments, net	116	122
Total investments	1,856	1,906
Cash	44	0
Deferred policy acquisitions costs	525	521
Reinsurance recoverables, net	117	111
Other assets	527	554
Total assets held for sale	3,069	3,092
Liabilities
Reserve for future policy benefits	1,096	1,085
Contractholder funds	882	890
Other liabilities and accrued expenses	138	138
Total liabilities held for sale	2,116	2,113
Fixed income securities, amortized cost	1,764	1,809
Short term, amortized cost	64	$ 85
Disposal Group, Held-for-Sale, Not Discontinued Operations | Group health
Investments
Fixed income securities, at fair value (amortized cost, net $1,764, $208, $1,972 and $1,809)	205
Short-term, at fair value (amortized cost $64, $13, $77 and $85)	13
Other investments, net	0
Total investments	218
Cash	157
Deferred policy acquisitions costs	1
Reinsurance recoverables, net	42
Other assets	299
Total assets held for sale	717
Liabilities
Reserve for future policy benefits	201
Contractholder funds	0
Other liabilities and accrued expenses	58
Total liabilities held for sale	259
Fixed income securities, amortized cost	208
Short term, amortized cost	13
Disposal Group, Held-for-Sale, Not Discontinued Operations | Total
Investments
Fixed income securities, at fair value (amortized cost, net $1,764, $208, $1,972 and $1,809)	1,881
Short-term, at fair value (amortized cost $64, $13, $77 and $85)	77
Other investments, net	116
Total investments	2,074
Cash	201
Deferred policy acquisitions costs	526
Reinsurance recoverables, net	159
Other assets	826
Total assets held for sale	3,786
Liabilities
Reserve for future policy benefits	1,297
Contractholder funds	882
Other liabilities and accrued expenses	196
Total liabilities held for sale	2,375
Fixed income securities, amortized cost	1,972
Short term, amortized cost	$ 77