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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,974	$ 3,709
Gross unrealized gains	8	2
Gross unrealized losses	172	212
Estimated Fair Value	3,810	3,499
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,428	2,303
Gross unrealized gains	6	2
Gross unrealized losses	99	121
Estimated Fair Value	2,335	2,184
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	897	787
Gross unrealized gains	2	0
Gross unrealized losses	48	56
Estimated Fair Value	851	731
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	337	308
Gross unrealized gains	0	0
Gross unrealized losses	14	20
Estimated Fair Value	323	288
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	160	160
Gross unrealized gains	0	0
Gross unrealized losses	9	11
Estimated Fair Value	151	149
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	123	106
Gross unrealized gains	0	0
Gross unrealized losses	0	1
Estimated Fair Value	123	105
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29	45
Gross unrealized gains	0	0
Gross unrealized losses	2	3
Estimated Fair Value	$ 27	$ 42

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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