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Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		1 Months Ended				3 Months Ended	4 Months Ended	12 Months Ended
	Jan. 23, 2020	Dec. 31, 2022	Oct. 31, 2022	Jul. 31, 2022	Jun. 30, 2022	Sep. 30, 2022	Oct. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Subsidiary, Sale of Stock [Line Items]
Stock repurchase program, increase to authorized amount		$ 2,000			$ 3,000
Stock repurchase program increase amount		6,000						$ 6,000
Common stock repurchases								3,096	$ 297	$ 626
Remaining authorized repurchase amount		$ 2,806						$ 2,806
WellCare
Subsidiary, Sale of Stock [Line Items]
Shares issued in business acquisition (in shares)	171,000
Equity value issued in business acquisition	$ 11,431
Cash payments to acquire business	6,079
Fair value adjustment to stock based compensation associated with pre-combination service	$ 95
Employee Stock Compensation Plan
Subsidiary, Sale of Stock [Line Items]
Income tax withholding (in shares)								1,213	1,379	2,045
Employee Stock Compensation Plan | WellCare
Subsidiary, Sale of Stock [Line Items]
Income tax withholding (in shares)									326	407
Common stock repurchases									$ 19	$ 24
Common Stock
Subsidiary, Sale of Stock [Line Items]
Common stock repurchases (in shares)								36,868	3,781	10,717
Common stock repurchases								$ 3,096	$ 297	$ 626
Accelerated Share Repurchase Agreement
Subsidiary, Sale of Stock [Line Items]
ASR, discount (in usd per share)			$ 86.21
Accelerated Share Repurchase Agreement | Common Stock
Subsidiary, Sale of Stock [Line Items]
Accelerated share repurchases agreement, amount						$ 1,000
Common stock repurchases (in shares)			3,000	8,600			11,600
Percentage of notional amount under ASR				80.00%

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