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Derivative Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Derivative [Line Items]
Collateral posted	$ 80		$ 80
Collateral received					$ 34
Recognized gain on hedging derivatives		$ 0
Recognized loss on hedging derivatives	(20)		(20)	$ (2)
Mosaic Health
Derivative [Line Items]
Net put option fair value	1,330		1,330
Liberty Dental
Derivative [Line Items]
Net put option fair value	396		396
Cash Flow Hedging
Derivative [Line Items]
Cash flow hedges included in accumulated other comprehensive loss, net of tax	$ 187		$ 187		$ 192