Value of Business Acquired, Goodwill, and Other Intangible Assets (Estimated Amortization Expense Over Next Five Years) (Details) $ in Millions	Sep. 30, 2022 USD ($)
Finite-Lived Intangible Assets [Line Items]
Fourth quarter of 2022, Other intangible assets	$ 71
2023, Other intangible assets	268
2024, Other intangible assets	246
2025, Other intangible assets	229
2026, Other intangible assets	213
2027, Other intangible assets	198
Total, Other intangible assets	1,225
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Fourth quarter of 2022, Other intangible assets	25	[1]
2023, Other intangible assets	96	[1]
2024, Other intangible assets	89	[1]
2025, Other intangible assets	87	[1]
2026, Other intangible assets	84	[1]
2027, Other intangible assets	81	[1]
Total, Other intangible assets	462	[1]
Cigna's Life Insurance Business in Asia-Pacific Markets [Member]
Finite-Lived Intangible Assets [Line Items]
Fourth quarter of 2022, Other intangible assets	1	[2]
2023, Other intangible assets	2	[2]
2024, Other intangible assets	4	[2]
2025, Other intangible assets	5	[2]
2026, Other intangible assets	6	[2]
2027, Other intangible assets	9	[2]
Total, Other intangible assets	27	[2]
The Chubb Corporation
Finite-Lived Intangible Assets [Line Items]
Fourth quarter of 2022, Other intangible assets	45	[3]
2023, Other intangible assets	170	[3]
2024, Other intangible assets	153	[3]
2025, Other intangible assets	137	[3]
2026, Other intangible assets	123	[3]
2027, Other intangible assets	108	[3]
Total, Other intangible assets	$ 736	[3]

[1] Recorded in applicable segment(s) that acquired the intangible assets

[2] Recorded in Life Insurance segment.

[3] Recorded in Corporate.