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Acquisitions and Divestitures - Divestitures (Details) - USD ($) $ in Millions				3 Months Ended	12 Months Ended
	Jan. 20, 2023	Dec. 02, 2022	Jul. 14, 2022	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Gain) on divestitures					$ (772)	$ (88)	$ (104)
Impairment charge					2,318	$ 229	$ 72
PANTHERx Rare | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestitures			$ 1,373
(Gain) on divestitures			(490)
(Gain) on divestitures, net of tax			$ 382
Spanish and Central European Businesses | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge					163
Impairment charge, net of tax					140
Magellan Rx | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestitures		$ 1,337
(Gain) on divestitures		(269)
(Gain) on divestitures, net of tax		$ (99)
Magellan Specialty Health | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration on divestiture	$ 646
Contingent consideration, could receive (up to)	150
Magellan Specialty Health | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Subsequent Event | Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Gain) on divestitures	(85)
Magellan Specialty Health | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Subsequent Event | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Gain) on divestitures	$ (95)
Magellan Specialty Health | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale				$ 645	645
Liabilities held for sale				87	87
Centurion | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge				259
Impairment charge, net of tax				181
Assets held for sale				236	236
Liabilities held for sale				198	198
HealthSmart | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge				36
Impairment charge, net of tax				27
Assets held for sale				66	66
Liabilities held for sale				$ 34	$ 34

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