Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Mar. 28, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Collateral received	$ 34	$ 142
Liberty Dental
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net put option fair value	327	543
Carrying value of the net put option		85	$ 396
Mosaic Health
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net put option fair value	2,717	1,330
Carrying value of the net put option		1,330
Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrecognized loss for expired and terminated cash flow hedges	192	201
Total amount of amortization over the next twelve months for all cash flow hedges	13
Cash Flow Hedging | Terminations
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Terminated derivatives	$ 150	$ 900