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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,904	$ 1,826
Gross unrealized gains	36	50
Gross unrealized losses	2	1
Estimated Fair Value	1,938	1,875
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,162	1,220
Gross unrealized gains	27	36
Gross unrealized losses	1	0
Estimated Fair Value	1,188	1,256
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	424	383
Gross unrealized gains	6	10
Gross unrealized losses	1	1
Estimated Fair Value	429	392
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	150	130
Gross unrealized gains	2	2
Gross unrealized losses	0	0
Estimated Fair Value	152	132
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	97	27
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated Fair Value	97	27
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	71	66
Gross unrealized gains	1	2
Gross unrealized losses	0	0
Estimated Fair Value	$ 72	$ 68

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- 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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