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Investments - Amortized Cost, Gross Unrealized Gains and Losses, Fair Values of Investments (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Debt Securities
Amortized Cost	$ 560	$ 538
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(13)	(2)
Fair Value	547	538
Asset-backed securities
Debt Securities
Amortized Cost	47	49
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	0
Fair Value	45	49
Corporate bonds
Debt Securities
Amortized Cost	170	167
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(4)	(1)
Fair Value	166	167
U.S. government agencies and government- sponsored agencies
Debt Securities
Amortized Cost	16	17
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Fair Value	15	17
U.S. treasuries
Debt Securities
Amortized Cost	308	285
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(6)	(1)
Fair Value	302	285
Certificate of deposits
Debt Securities
Amortized Cost	11	11
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	11	11
Other debt securities
Debt Securities
Amortized Cost	8	9
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 8	$ 9

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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