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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,094	$ 3,208
Gross unrealized gains	1	12
Gross unrealized losses	107	18
Estimated Fair Value	2,988	3,202
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,874	1,836
Gross unrealized gains	1	9
Gross unrealized losses	67	12
Estimated Fair Value	1,808	1,833
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	622	616
Gross unrealized gains	0	2
Gross unrealized losses	24	4
Estimated Fair Value	598	614
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	261	248
Gross unrealized gains	0	0
Gross unrealized losses	9	1
Estimated Fair Value	252	247
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	174	353
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated Fair Value	174	353
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	123	123
Gross unrealized gains	0	1
Gross unrealized losses	6	1
Estimated Fair Value	117	123
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	40	32
Gross unrealized gains	0	0
Gross unrealized losses	1	0
Estimated Fair Value	$ 39	$ 32

X

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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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