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Investments - Schedule of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,208	$ 1,826
Gross Unrealized Gains	12	50
Gross Unrealized Losses	18	1
Estimated Fair Value	3,202	1,875
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,836	1,220
Gross Unrealized Gains	9	36
Gross Unrealized Losses	12	0
Estimated Fair Value	1,833	1,256
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	616	383
Gross Unrealized Gains	2	10
Gross Unrealized Losses	4	1
Estimated Fair Value	614	392
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	353	27
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	353	27
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	248	130
Gross Unrealized Gains	0	2
Gross Unrealized Losses	1	0
Estimated Fair Value	247	132
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	123	66
Gross Unrealized Gains	1	2
Gross Unrealized Losses	1	0
Estimated Fair Value	123	$ 68
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	32
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	$ 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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