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Investments (Tables)

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Schedule of investments

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

			December 31, 2022
			Amortized Cost						Gross Unrealized												Estimated Fair Value
									Gains						Losses
			(In millions)
Corporate debt securities			$	2,303					$	2					$	121					$	2,184
Mortgage-backed securities			787						—						56						731
Asset-backed securities			308						—						20						288
Municipal securities			160						—						11						149
U.S. Treasury notes			106						—						1						105
Other			45						—						3						42
Total			$	3,709					$	2					$	212					$	3,499

			December 31, 2021
			Amortized Cost						Gross Unrealized												Estimated Fair Value
									Gains						Losses
			(In millions)
Corporate debt securities			$	1,836					$	9					$	12					$	1,833
Mortgage-backed securities			616						2						4						614
Asset-backed securities			248						—						1						247
Municipal securities			123						1						1						123
U.S. Treasury notes			353						—						—						353
Other			32						—						—						32
Total			$	3,208					$	12					$	18					$	3,202

Schedule of contractual maturities of investments

The contractual maturities of our current investments as of December 31, 2022 are summarized below:

			Amortized Cost						Estimated Fair Value
			(In millions)
Due in one year or less			$	318					$	315
Due after one year through five years			2,249						2,127
Due after five years through ten years			364						345
Due after ten years			778						712
Total			$	3,709					$	3,499

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, 2022:

			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			$	1,124					$	45					683						$	887					$	76					371
Mortgage-backed securities			395						20						220						319						36						131
Asset-backed securities			161						6						108						118						14						59
Municipal securities			75						4						83						57						7						57
U.S. Treasury notes			88						1						6						—						—						—
Other			15						1						16						17						2						6
Total			$	1,858					$	77					1,116						$	1,398					$	135					624

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, 2021:

			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			$	1,063					$	12					395						$	—					$	—					—
Mortgage-backed securities			408						4						146						—						—						—
Asset-backed securities			166						1						75						—						—						—
Municipal securities			69						1						61						—						—						—
Total			$	1,706					$	18					677						$	—					$	—					—

Schedule of balances of restricted investments

The following table presents the balances of restricted investments:

			December 31,
			2022						2021
			(In millions)
Cash and cash equivalents			$	42					$	68
U.S. Treasury notes			159						144
Corporate debt securities			37						—
Total restricted investments			$	238					$	212

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