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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,206	$ 1,826
Gross unrealized gains	36	50
Gross unrealized losses	1	1
Estimated Fair Value	2,241	1,875
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,367	1,220
Gross unrealized gains	26	36
Gross unrealized losses	0	0
Estimated Fair Value	1,393	1,256
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	542	383
Gross unrealized gains	7	10
Gross unrealized losses	1	1
Estimated Fair Value	548	392
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	174	130
Gross unrealized gains	2	2
Gross unrealized losses	0	0
Estimated Fair Value	176	132
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	74	66
Gross unrealized gains	1	2
Gross unrealized losses	0	0
Estimated Fair Value	75	68
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	26	27
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated Fair Value	26	$ 27
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23
Gross unrealized gains	0
Gross unrealized losses	0
Estimated Fair Value	$ 23

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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