Assets and Liabilities Measured at Fair Value (Tables)

12 Months Ended

Dec. 31, 2024

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 December 31, 2024 and 2023, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):

	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	$	—

	2023
				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	$	376		$	—		$	376	$	—
Money market funds and other		188			188			—		—
Investments of insurance subsidiaries		564			188			376		—
Less amounts classified as current assets		(87	)		(87	)		—		—
	$	477		$	101		$	376	$	—