Assets and Liabilities Measured at Fair Value (Tables)

6 Months Ended

Jun. 30, 2025

Fair Value Disclosures [Abstract]

Summary of Investments of Insurance Subsidiaries Measured at Fair Value on Recurring Basis

The following tables summarize the investments of our insurance subsidiaries measured at fair value on a recurring basis as of June 30, 2025 and December 31, 2024, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):

	June 30, 2025
				Fair Value Measurements Using
	Fair Value			Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Debt securities	$	331		$	1		$	330	$	—
Money market funds and other		301			301			—		—
Investments of insurance subsidiaries		632			302			330		—
Less amounts classified as current assets		(101	)		(101	)		—		—
	$	531		$	201		$	330	$	—

	December 31, 2024
				Fair Value Measurements Using
	Fair Value			Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Debt securities	$	361		$	—		$	361	$	—
Money market funds and other		296			296			—		—
Investments of insurance subsidiaries		657			296			361		—
Less amounts classified as current assets		(88	)		(88	)		—		—
	$	569		$	208		$	361	$	—