Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets
Foreign tax attributes	$ 1,800	$ 1,800
Deferred loss - sale of business	773	584
Deferred tax assets, including held for sale assets
Foreign tax attributes	1,752	1,827
Deferred loss - sale of business	773	584
Investments	561	0
Other insurance and contractholder liabilities	300	353
Loss carryforwards	270	200
Other accrued liabilities	207	244
Employee and retiree benefit plans	177	217
Unrealized depreciation on investments and foreign currency translation	93	81
Policy acquisition expenses	0	39
Other	256	242
Deferred tax assets before valuation allowance	4,389	3,787
Valuation allowance for deferred tax assets	(2,332)	(1,498)
Deferred tax assets, net of valuation allowance	2,057	2,289
Deferred tax liabilities, including held for sale liabilities
Acquisition-related basis differences	7,822	8,105
Depreciation and amortization	243	371
Policy acquisition expenses	74	0
Total deferred tax liabilities	8,139	8,476
Deferred tax liabilities, net, including amounts reported in Liabilities of businesses held for sale	(6,082)	(6,187)
Deferred tax assets reported in Other Assets	954	1,055
Held-for-Sale | Medicare Advantage and related Cigna Healthcare businesses
Deferred tax liabilities, including held for sale liabilities
Net deferred income tax liabilities classified as liabilities of businesses held for sale	$ 61	$ 69