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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	$ 4,325	$ 4,259
Total assets	4,325	4,259
Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	2,744	2,732
Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	914	911
Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	431	365
Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	183	166
U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	5	40
Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	48	45
Level 1
Fair value of assets measured on recurring basis
Total assets	0	0
Level 1 | Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 1 | Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 1 | Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 1 | Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 1 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 1 | Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 2
Fair value of assets measured on recurring basis
Total assets	4,325	4,259
Level 2 | Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	2,744	2,732
Level 2 | Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	914	911
Level 2 | Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	431	365
Level 2 | Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	183	166
Level 2 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	5	40
Level 2 | Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	48	45
Level 3
Fair value of assets measured on recurring basis
Total assets	0	0
Level 3 | Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 3 | Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 3 | Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 3 | Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 3 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 3 | Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	$ 0	$ 0

X

- Definition

Fair value portion of asset recognized for present right to economic benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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- Definition

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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