SEGMENT INFORMATION (Tables)

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, By Segment

	Retail		Group and Specialty		Healthcare Services		Eliminations/ Corporate		Consolidated
	(in millions)
2020
External revenues
Premiums:
Individual Medicare Advantage	$	51,697	$	—	$	—	$	—	$	51,697
Group Medicare Advantage	7,774		—		—		—		7,774
Medicare stand-alone PDP	2,742		—		—		—		2,742
Total Medicare	62,213		—		—		—		62,213
Fully-insured	688		4,761		—		602		6,051
Specialty	—		1,699		—		—		1,699
Medicaid and other	4,223		—		—		—		4,223
Total premiums	67,124		6,460		—		602		74,186
Services revenue:
Provider	—		—		435		—		435
ASO and other	19		780		—		—		799
Pharmacy	—		—		581		—		581
Total services revenue	19		780		1,016		—		1,815
Total external revenues	67,143		7,240		1,016		602		76,001
Intersegment revenues
Services	—		29		19,491		(19,520)		—
Products	—		—		7,928		(7,928)		—
Total intersegment revenues	—		29		27,419		(27,448)		—
Investment income	155		16		13		970		1,154
Total revenues	67,298		7,285		28,448		(25,876)		77,155
Operating expenses:
Benefits	56,537		5,529		—		(438)		61,628
Operating costs	7,402		1,818		27,395		(26,563)		10,052
Depreciation and amortization	342		81		183		(117)		489
Total operating expenses	64,281		7,428		27,578		(27,118)		72,169
Income (loss) from operations	3,017		(143)		870		1,242		4,986
Interest expense	—		—		—		283		283
Other expense, net	—		—		—		103		103
Income (loss) before income taxes and equity in net earnings	3,017		(143)		870		856		4,600
Equity in net earnings	—		—		74		—		74
Segment earnings (loss)	$	3,017	$	(143)	$	944	$	856	$	4,674

	Retail		Group and Specialty		Healthcare Services		Eliminations/ Corporate		Consolidated
	(in millions)
2019
External revenues
Premiums:
Individual Medicare Advantage	$	43,128	$	—	$	—	$	—	$	43,128
Group Medicare Advantage	6,475		—		—		—		6,475
Medicare stand-alone PDP	3,165		—		—		—		3,165
Total Medicare	52,768		—		—		—		52,768
Fully-insured	588		5,123		—		—		5,711
Specialty	—		1,571		—		—		1,571
Medicaid and other	2,898		—		—		—		2,898
Total premiums	56,254		6,694		—		—		62,948
Services revenue:
Provider	—		—		446		—		446
ASO and other	17		790		—		—		807
Pharmacy	—		—		186		—		186
Total services revenue	17		790		632		—		1,439
Total external revenues	56,271		7,484		632		—		64,387
Intersegment revenues
Services	—		18		18,255		(18,273)		—
Products	—		—		6,894		(6,894)		—
Total intersegment revenues	—		18		25,149		(25,167)		—
Investment income	195		23		2		281		501
Total revenues	56,466		7,525		25,783		(24,886)		64,888
Operating expenses:
Benefits	48,602		5,758		—		(503)		53,857
Operating costs	5,306		1,651		24,852		(24,428)		7,381
Depreciation and amortization	323		88		156		(109)		458
Total operating expenses	54,231		7,497		25,008		(25,040)		61,696
Income from operations	2,235		28		775		154		3,192
Interest expense	—		—		—		242		242
Other income, net	—		—		—		(506)		(506)
Income before income taxes and equity in net earnings	2,235		28		775		418		3,456
Equity in net earnings	—		—		14		—		14
Segment earnings	$	2,235	$	28	$	789	$	418	$	3,470

	Retail		Group and Specialty		Healthcare Services		Individual Commercial		Other Businesses		Eliminations/ Corporate		Consolidated
	(in millions)
2018
External revenues
Premiums:
Individual Medicare Advantage	$	35,656	$	—	$	—	$	—	$	—	$	—	$	35,656
Group Medicare Advantage	6,103		—		—		—		—		—		6,103
Medicare stand-alone PDP	3,584		—		—		—		—		—		3,584
Total Medicare	45,343		—		—		—		—		—		45,343
Fully-insured	510		5,444		—		8		—		—		5,962
Specialty	—		1,359		—		—		—		—		1,359
Medicaid and other	2,255		—		—		—		22		—		2,277
Total premiums	48,108		6,803		—		8		22		—		54,941
Services revenue:
Provider	—		—		404		—		—		—		404
ASO and other	11		835		—		—		4		—		850
Pharmacy	—		—		203		—		—		—		203
Total services revenue	11		835		607		—		4		—		1,457
Total external revenues	48,119		7,638		607		8		26		—		56,398
Intersegment revenues
Services	—		18		16,840		—		—		(16,858)		—
Products	—		—		6,330		—		—		(6,330)		—
Total intersegment revenues	—		18		23,170		—		—		(23,188)		—
Investment income	136		23		34		—		110		211		514
Total revenues	48,255		7,679		23,811		8		136		(22,977)		56,912
Operating expenses:
Benefits	40,925		5,420		—		(70)		77		(470)		45,882
Operating costs	5,327		1,810		22,905		4		6		(22,527)		7,525
Depreciation and amortization	270		88		163		—		—		(116)		405
Total operating expenses	46,522		7,318		23,068		(66)		83		(23,113)		53,812
Income from operations	1,733		361		743		74		53		136		3,100
Loss on sale of business	—		—		—		—		—		786		786
Interest expense	—		—		—		—		—		218		218
Other expense, net	—		—		—		—		—		33		33
Income (loss) before income taxes and equity in net earnings	1,733		361		743		74		53		(901)		2,063
Equity in net earnings	—		—		11		—		—		—		11
Segment earnings (loss)	$	1,733	$	361	$	754	$	74	$	53	$	(901)	$	2,074