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Investments - Schedule of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,709	$ 3,208
Gross Unrealized Gains	2	12
Gross Unrealized Losses	212	18
Estimated Fair Value	3,499	3,202
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,303	1,836
Gross Unrealized Gains	2	9
Gross Unrealized Losses	121	12
Estimated Fair Value	2,184	1,833
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	787	616
Gross Unrealized Gains	0	2
Gross Unrealized Losses	56	4
Estimated Fair Value	731	614
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	308	248
Gross Unrealized Gains	0	0
Gross Unrealized Losses	20	1
Estimated Fair Value	288	247
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	160	123
Gross Unrealized Gains	0	1
Gross Unrealized Losses	11	1
Estimated Fair Value	149	123
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	106	353
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	0
Estimated Fair Value	105	353
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	45	32
Gross Unrealized Gains	0	0
Gross Unrealized Losses	3	0
Estimated Fair Value	$ 42	$ 32

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).

+ References

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