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Income Taxes - Reconciliation of the Tax Provision at the U.S. Federal Statutory Rate to the Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Earnings before income tax	$ 1,962	$ 1,813	$ 2,773
Loss (earnings) attributable to flow through noncontrolling interest	(6)	2	9
Earnings less noncontrolling interest before income tax expense	1,956	1,815	2,782
Tax provision at the U.S. federal statutory rate	411	381	584
State income taxes, net of federal income tax benefit	50	63	106
Nondeductible compensation	49	40	54
Nondeductible PBM legal settlement	(5)	78	0
Nontaxable divestiture (gains) losses	111	(95)	0
Deferred taxes for investments in subsidiaries	84	0	0
ACA health insurer fee	0	0	316
Audit settlement	0	0	(71)
Valuation allowance	(17)	29	(11)
Nondeductible goodwill	69	0	16
Other, net	8	(19)	(15)
Income tax expense	$ 760	$ 477	$ 979

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