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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,878	$ 1,826
Gross unrealized gains	25	50
Gross unrealized losses	3	1
Estimated Fair Value	2,900	1,875
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,688	1,220
Gross unrealized gains	19	36
Gross unrealized losses	2	0
Estimated Fair Value	1,705	1,256
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	607	383
Gross unrealized gains	4	10
Gross unrealized losses	1	1
Estimated Fair Value	610	392
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	235	27
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated Fair Value	235	27
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	223	130
Gross unrealized gains	1	2
Gross unrealized losses	0	0
Estimated Fair Value	224	132
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	96	66
Gross unrealized gains	1	2
Gross unrealized losses	0	0
Estimated Fair Value	97	$ 68
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29
Gross unrealized gains	0
Gross unrealized losses	0
Estimated Fair Value	$ 29

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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