Schedule I - Condensed Financial Information of Cigna Corporation - Statements of Cash Flows (Details) - USD ($) $ in Millions		2 Months Ended	12 Months Ended
		Apr. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities
Shareholders' net income			$ 5,365	$ 8,458	$ 5,104
Adjustments to reconcile shareholders' net income to net cash provided by (used in) operating activities:
Debt extinguishment costs			141	199	2
Other liabilities			(77)	1,346	1,343
Other, net			333	597	559
NET CASH PROVIDED BY OPERATING ACTIVITIES			7,191	10,350	9,485
Cash Flows from Investing Activities
Short-term investment purchased, net			(2,554)	(1,924)	(1,753)
NET CASH (USED IN) PROVIDED BY INVESTING ACTIVITIES			(3,611)	2,976	(734)
Cash Flows from Financing Activities
Payments for debt extinguishment			(136)	(212)	(3)
Repayment of long-term debt			(4,578)	(8,047)	(4,491)
Net proceeds on issuance of long-term debt			4,260	3,465	0
Issuance of common stock			326	376	224
Common dividends paid			(1,341)	(15)	(15)
Repurchase of common stock			(7,742)	(4,042)	(1,987)
Other, net			39	(160)	(92)
NET CASH (USED IN) FINANCING ACTIVITIES			(8,212)	(8,533)	(7,187)
Net (decrease) increase in cash, cash equivalents and restricted cash			(4,697)	4,834	1,556
Cash and cash equivalents, beginning of year	[1]		10,245	4,668
Cash and cash equivalents, end of year	[1]		5,123	10,245	4,668
Cigna
Cash Flows from Operating Activities
Shareholders' net income			5,365	8,458	5,104
Adjustments to reconcile shareholders' net income to net cash provided by (used in) operating activities:
Equity in income of subsidiaries			(6,063)	(9,295)	(5,921)
Debt extinguishment costs		$ 131	131	171	0
Dividends received from subsidiaries			2,751	8,627	2,457
Other liabilities			184	112	43
Other, net			414	500	20
NET CASH PROVIDED BY OPERATING ACTIVITIES			2,782	8,573	1,703
Cash Flows from Investing Activities
Net change in loans due to (from) affiliates			(1,007)	(265)	0
Short-term investment purchased, net			(50)	(19)	(30)
NET CASH (USED IN) PROVIDED BY INVESTING ACTIVITIES			(1,057)	(284)	(30)
Cash Flows from Financing Activities
Net change in amounts due to affiliates			2,062	2,262	2,015
Net change in short-term debt			997	86	944
Payments for debt extinguishment			(126)	(181)	0
Repayment of long-term debt			(4,199)	(5,996)	(3,002)
Net proceeds on issuance of long-term debt			4,260	3,465	0
Issuance of common stock			326	376	224
Common dividends paid			(1,341)	(15)	(15)
Repurchase of common stock			(7,742)	(4,042)	(1,987)
Tax withholding on stock compensation and other			(86)	(87)	(82)
Other, net			0	0	(13)
NET CASH (USED IN) FINANCING ACTIVITIES			(5,849)	(4,132)	(1,916)
Net (decrease) increase in cash, cash equivalents and restricted cash			(4,124)	4,157	(243)
Cash and cash equivalents, beginning of year			4,157	0	243
Cash and cash equivalents, end of year			$ 33	$ 4,157	$ 0

[1] Restricted cash and cash equivalents were reported in Other long-term investments as of December 31, 2021 and December 31, 2020 and were reported in Other long-term investments and Other assets as of December 31, 2019.