Schedule I - Condensed Financial Information of Cigna Corporation - Statements of Income (Details) - USD ($) $ in Millions	2 Months Ended	12 Months Ended
	Apr. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Net investment income		$ 1,244	$ 1,390	$ 1,480
TOTAL REVENUES		160,401	153,566	48,650
Operating expenses
Selling, general and administrative expenses		14,072	14,053	11,934
TOTAL BENEFITS AND EXPENSES		152,248	145,489	44,490
Income (loss) from operations		8,153	8,077	4,160
Interest expense and other		(1,438)	(1,682)	(498)
Debt extinguishment costs	$ (199)	(199)	(2)	0
Net realized investment gains (losses)		149	177	(81)
Income before income taxes		10,868	6,570	3,581
Income tax (benefit)		2,379	1,450	935
SHAREHOLDERS' NET INCOME		8,458	5,104	2,637
Other comprehensive income (loss), net of tax
SHAREHOLDERS' COMPREHENSIVE INCOME		8,538	5,874	2,247
Cigna
Revenues
Net investment income		1	0	123
Intercompany interest income		475	6	0
TOTAL REVENUES		476	6	123
Operating expenses
Selling, general and administrative expenses		4	(85)	200
TOTAL BENEFITS AND EXPENSES		4	(85)	200
Income (loss) from operations		472	91	(77)
Interest expense and other		(1,324)	(1,032)	(244)
Intercompany interest (expense)		(48)	(127)	(5)
Debt extinguishment costs	$ (171)	(171)	0	0
Net realized investment gains (losses)		0	0	(1)
Income before income taxes		(1,071)	(1,068)	(327)
Income tax (benefit)		(234)	(251)	(74)
Loss of Parent Company		(837)	(817)	(253)
Equity in income of subsidiaries		9,295	5,921	2,890
SHAREHOLDERS' NET INCOME		8,458	5,104	2,637
Other comprehensive income (loss), net of tax
Net unrealized appreciation (depreciation) on securities and derivatives		(75)	957	(365)
Net translation gains (losses) on foreign currencies		260	(54)	(152)
Postretirement benefits liability adjustment		(105)	(133)	127
Shareholders' other comprehensive income (loss), net of tax		80	770	(390)
SHAREHOLDERS' COMPREHENSIVE INCOME		$ 8,538	$ 5,874	$ 2,247