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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	$ 4,438	$ 4,325
Total assets	4,438	4,325
Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	2,751	2,744
Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	983	914
Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	441	431
Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	210	183
U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	5	5
Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	48	48
(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	4,438	4,325
(Level 2) | Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	2,751	2,744
(Level 2) | Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	983	914
(Level 2) | Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	441	431
(Level 2) | Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	210	183
(Level 2) | U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	5	5
(Level 2) | Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	48	48
(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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- References

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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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