Assets and Liabilities Measured at Fair Value (Tables)

3 Months Ended

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

	March 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	$	372		$	—		$	372	$	—
Money market funds and other		194			194			—		—
Investments of insurance subsidiaries		566			194			372		—
Less amounts classified as current assets		(95	)		(95	)		—		—
	$	471		$	99		$	372	$	—

	December 31, 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	$	—