Acquisitions (Details) - USD ($) $ in Millions			3 Months Ended				9 Months Ended
		Jul. 01, 2022	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill			$ 16,107				$ 16,107		$ 15,213
Other intangible assets			5,383				5,383		5,455
Value of business acquired (preliminary)			3,324				3,324		236
Repurchase agreements			2,417				2,417		1,406
Accrued investment income			900				900		821
Insurance and reinsurance balances receivable			12,853				12,853		11,322
Reinsurance recoverable on losses and loss expenses	[1]		18,754				18,754		17,366
Reinsurance recoverable on policy benefits	[1]		297				297		213
Other assets			13,077				13,077		11,792
Total assets			198,111				198,111		200,054
Liability for Claims and Claims Adjustment Expense			75,992		$ 72,631		75,992	$ 72,631	72,943	$ 67,811
Unearned premiums			20,520				20,520		19,101
Future policy benefits			9,586				9,586		5,947
Insurance and reinsurance balances payable			7,829				7,829		7,243
Accounts payable, accrued expenses, and other liabilities			16,673				16,673		15,004
Deferred tax liabilities			2				2		389
Total liabilities			150,472				150,472		140,340
Balance – beginning of period, net of tax			47,639		59,318		47,639	59,318	59,714
Total liabilities and shareholders’ equity			198,111				198,111		200,054
Cigna integration expenses			23		0		26	0
Total revenues			12,130		10,845		31,740	30,480
Net income (loss)			812		1,833		4,001	6,398
Net premiums earned			11,535		10,000		29,838	27,034
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization			2,417				2,417		2,508
Intangible assets not subject to amortization			2,966				2,966		2,947
Total identified intangible assets			5,383				5,383		5,455
Huatai Group
Business Acquisition [Line Items]
Equity method investment, additional 31.8 percent agreed on				31.80%
Purchase of incremental ownership interest							2,200
Deposits Assets									$ 1,100
Payment to acquire additional ownership interest in equity method investment						$ 500	113
Equity method investment, additional 7.1 percentage agreed on						7.10%
Cigna's Life Insurance Business in Asia-Pacific Markets [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Jul. 01, 2022
Payments to Acquire Businesses, Gross		$ 5,360
Goodwill		1,340
Other intangible assets		269
Value of business acquired (preliminary)		3,379
Repurchase agreements		2,000
Investments and Cash		5,311
Accrued investment income		33
Insurance and reinsurance balances receivable		52
Reinsurance recoverable on losses and loss expenses		3
Reinsurance recoverable on policy benefits		82
Goodwill and other intangible assets		1,609
Other assets		655
Total assets		11,124
Liability for Claims and Claims Adjustment Expense		10
Unearned premiums		60
Future policy benefits		3,844
Insurance and reinsurance balances payable		115
Accounts payable, accrued expenses, and other liabilities		925
Deferred tax liabilities		839
Total liabilities		5,793
Balance – beginning of period, net of tax		5,331
Total liabilities and shareholders’ equity		11,124
Cigna integration expenses			23				26
Total revenues					681
Net income (loss)					21
Finite-Lived Intangible Assets [Line Items]
Total identified intangible assets		269
Cigna's Life Insurance Business in Asia-Pacific Markets [Member] | Maturity 30 to 90 Days [Member]
Business Acquisition [Line Items]
Repurchase agreements		1,000
Cigna's Life Insurance Business in Asia-Pacific Markets [Member] | Pro Forma
Business Acquisition [Line Items]
Net premiums earned			11,535		10,788		31,362	29,406
Total revenues			12,132		11,632		33,253	32,879
Net income			$ 825		$ 1,894		$ 4,203	$ 6,649
Cigna's Life Insurance Business in Asia-Pacific Markets [Member] | Trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization		70
Direct ownership | Huatai Group
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage			47.30%				47.30%
Agency distribution relationships and renewal rights | Cigna's Life Insurance Business in Asia-Pacific Markets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization		$ 190
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life		20 years
Unearned premium reserves (UPR) intangible asset | Cigna's Life Insurance Business in Asia-Pacific Markets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization		$ 9
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life		1 year

[1] Net of valuation allowance for uncollectible reinsurance.