Schedule I - Condensed Financial Information, Balance Sheets (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018	Dec. 20, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents		$ 4,619	$ 3,855
Other current assets		1,400	1,236
Total current assets		29,845	20,430
Other noncurrent assets		2,283	1,630
TOTAL ASSETS		155,774	153,226
Liabilities:
Short-term debt		5,514	2,955
Total current liabilities		40,138	31,895
Long-term debt		31,893	39,523
Other non-current liabilities		4,460	3,470
TOTAL LIABILITIES		110,395	112,154
Shareholders Equity:
Common stock (shares issued, 296; authorized, 600)	[1]	4	4
Additional paid-in capital		28,306	27,751
Accumulated other comprehensive loss		(941)	(1,711)
Retained earnings		20,162	15,088
Less: treasury stock, at cost		(2,193)	(104)
Total shareholders' equity		45,338	41,028
Total liabilities and shareholders' equity		155,774	153,226
Cigna [Member]
Assets
Cash and cash equivalents		0	243	$ 243	$ 0
Short-term investments		30	0
Other current assets		4	14
Total current assets		34	257
Intercompany receivable		4,111	0
Investments in subsidiaries		77,380	68,969
Other noncurrent assets		19	48
TOTAL ASSETS		81,544	69,274
Liabilities:
Short-term debt		4,043	0
Other current liabilities		457	418
Total current liabilities		4,500	418
Intercompany payable		2,341	4,965
Long-term debt		29,365	22,863
Other non-current liabilities		0	0
TOTAL LIABILITIES		36,206	28,246
Shareholders Equity:
Common stock (shares issued, 296; authorized, 600)		4	4
Additional paid-in capital		28,306	27,751
Accumulated other comprehensive loss		(941)	(1,711)
Retained earnings		20,162	15,088
Less: treasury stock, at cost		(2,193)	(104)
Total shareholders' equity		45,338	41,028
Total liabilities and shareholders' equity		$ 81,544	$ 69,274
Old Cigna [Member]
Assets
Cash and cash equivalents					$ 9	$ 18

[1] Par value per share, $0.01; shares issued, 386 million as of December 31, 2019 and 381 million as of December 31, 2018; authorized shares; 600 million.