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Debt - Senior Notes (Details) - USD ($)	1 Months Ended			12 Months Ended
	Jan. 31, 2022	Aug. 31, 2021	Feb. 28, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jul. 31, 2021
Debt Instrument [Line Items]
Debt extinguishment costs				$ (25,000,000)	$ 125,000,000	$ 57,000,000
Senior Notes
Debt Instrument [Line Items]
Debt redemption amount				318,000,000
Gain on redemption of notes				$ (14,000,000)
Face amount		$ 1,800,000,000
Senior Notes | $3,500 Million 4.625% Senior Notes due December 2029 [Member]
Debt Instrument [Line Items]
Interest rate stated, percentage				4.625%
Debt redemption amount				$ 223,000,000
Face amount				$ 3,500,000,000
Senior Notes | $2,500 Million 4.25% Senior Notes due December 2027 [Member]
Debt Instrument [Line Items]
Interest rate stated, percentage				4.25%
Debt redemption amount				$ 95,000,000
Face amount				$ 2,500,000,000
Senior Notes | $2,200 Million 2.50% Senior Notes due 2031
Debt Instrument [Line Items]
Interest rate stated, percentage			2.50%
Face amount			$ 2,200,000,000
Senior Notes | $2,200 Million 4.75% Senior Notes due January 2025
Debt Instrument [Line Items]
Interest rate stated, percentage			4.75%
Face amount			$ 2,200,000,000
Aggregate percentage of principal outstanding			36.00%
Debt extinguishment costs			$ 46,000,000
Senior Notes | $1,800 Million 2.45% Senior Notes due March 2028
Debt Instrument [Line Items]
Interest rate stated, percentage							2.45%
Face amount		$ 500,000,000					$ 1,800,000,000
Premium yield		2.31%
Senior Notes | $1,300 Million 2.625% Senior Notes due August 2031 [Member]
Debt Instrument [Line Items]
Interest rate stated, percentage		2.625%		2.625%
Face amount		$ 1,300,000,000		$ 1,300,000,000
Senior Notes | 5.375% Senior notes, due 2026
Debt Instrument [Line Items]
Interest rate stated, percentage		5.375%
Debt extinguishment costs		$ 79,000,000
Magellan Health
Debt Instrument [Line Items]
Payoff of assumed debt	$ 535,000,000
Interest rate stated, percentage	4.40%

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