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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,882	$ 3,208
Gross unrealized gains	0	12
Gross unrealized losses	243	18
Estimated Fair Value	3,639	3,202
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,431	1,836
Gross unrealized gains	0	9
Gross unrealized losses	148	12
Estimated Fair Value	2,283	1,833
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	804	616
Gross unrealized gains	0	2
Gross unrealized losses	61	4
Estimated Fair Value	743	614
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	322	248
Gross unrealized gains	0	0
Gross unrealized losses	19	1
Estimated Fair Value	303	247
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	159	123
Gross unrealized gains	0	1
Gross unrealized losses	11	1
Estimated Fair Value	148	123
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	117	353
Gross unrealized gains	0	0
Gross unrealized losses	1	0
Estimated Fair Value	116	353
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	49	32
Gross unrealized gains	0	0
Gross unrealized losses	3	0
Estimated Fair Value	$ 46	$ 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).

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