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Investments (Tables)

12 Months Ended

Dec. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Investments

The following tables summarize our current investments as of the dates indicated:

			December 31, 2024
			Amortized Cost						Gross Unrealized												Estimated Fair Value
									Gains						Losses
			(In millions)
Corporate debt securities			$	2,769					$	10					$	35					$	2,744
Mortgage-backed securities			953						2						41						914
Asset-backed securities			435						2						6						431
Municipal securities			188						—						5						183
U.S. Treasury notes			5						—						—						5
Other			50						—						2						48
Total			$	4,400					$	14					$	89					$	4,325

			December 31, 2023
			Amortized Cost						Gross Unrealized												Estimated Fair Value
									Gains						Losses
			(In millions)
Corporate debt securities			$	2,781					$	16					$	65					$	2,732
Mortgage-backed securities			951						4						44						911
Asset-backed securities			376						1						12						365
Municipal securities			172						—						6						166
U.S. Treasury notes			40						—						—						40
Other			47						—						2						45
Total			$	4,367					$	21					$	129					$	4,259

Schedule of Contractual Maturities of Investments

The contractual maturities of our current investments as of December 31, 2024 are summarized below:

			Amortized Cost						Estimated Fair Value
			(In millions)
Due in one year or less			$	570					$	567
Due after one year through five years			2,224						2,202
Due after five years through ten years			500						494
Due after ten years			1,106						1,062
Total			$	4,400					$	4,325

Schedule of Available-for-Sale Investments

The following table segregates those available-for-sale investments that have been in a continuous loss position for less than 12 months, and those that have been in a continuous loss position for 12 months or more as of December 31, 2024:

			In a Continuous Loss Position for Less than 12 Months																		In a Continuous Loss Position for 12 Months or More
			Estimated Fair Value						Unrealized Losses						Total Number of Positions						Estimated Fair Value						Unrealized Losses						Total Number of Positions
			(Dollars in millions)
Corporate debt securities			$	811					$	10					541						$	935					$	25					449
Mortgage-backed securities			271						5						197						406						36						244
Asset-backed securities			84						1						48						143						5						73
Municipal securities			38						1						27						95						4						89
Other			—						—						—						15						2						16
Total			$	1,204					$	17					813						$	1,594					$	72					871

The following table segregates those available-for-sale investments that have been in a continuous loss position for less than 12 months, and those that have been in a continuous loss position for 12 months or more as of December 31, 2023:

			In a Continuous Loss Position for Less than 12 Months																		In a Continuous Loss Position for 12 Months or More
			Estimated Fair Value						Unrealized Losses						Total Number of Positions						Estimated Fair Value						Unrealized Losses						Total Number of Positions
			(Dollars in millions)
Corporate debt securities			$	263					$	1					160						$	1,553					$	64					754
Mortgage-backed securities			123						2						98						549						42						283
Asset-backed securities			—						—						—						195						12						91
Municipal securities			—						—						—						117						6						116
Other			—						—						—						17						2						17
Total			$	386					$	3					258						$	2,431					$	126					1,261

Schedule of Balances of Restricted Investments

The following table presents the balances of restricted investments:

			December 31,
			2024						2023
			(In millions)
Cash and cash equivalents			$	79					$	60
U.S. Treasury notes			191						167
Corporate debt and other securities			16						34
Total restricted investments			$	286					$	261

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