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Available-for-sale Debt Securities and Equity Securities - Summary of Available-for-Sale Debt Securities at Estimated Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Available-for-Sale Securities
Amortized Cost	$ 2,325	$ 2,501
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(34)	(4)
Estimated Fair Value	2,293	2,497
U.S. treasury securities
Available-for-Sale Securities
Amortized Cost	415	408
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(5)	(1)
Estimated Fair Value	410	407
U.S. government agencies securities
Available-for-Sale Securities
Amortized Cost	36	4
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	35	4
Non-U.S. government securities
Available-for-Sale Securities
Amortized Cost	34	50
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	34	50
Certificates of deposit
Available-for-Sale Securities
Amortized Cost	54	249
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	54	249
Corporate debt securities
Available-for-Sale Securities
Amortized Cost	1,452	1,365
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(26)	(2)
Estimated Fair Value	1,427	1,363
Residential mortgage and asset-backed securities
Available-for-Sale Securities
Amortized Cost	335	425
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3)	(1)
Estimated Fair Value	$ 333	$ 424

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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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Amount, before tax, of unrealized loss 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).

+ References

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-Name Accounting Standards Codification
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
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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

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