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Investments - Available-for-Sale Investments (Details) $ in Millions	Mar. 31, 2022 USD ($) position security	Dec. 31, 2021 USD ($) security position
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 2,428	$ 1,706
Unrealized Losses	$ 107	$ 18
Total Number of Positions | position	1,091	677
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 1,516	$ 1,063
Unrealized Losses	$ 67	$ 12
Total Number of Positions | position	624	395
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 582	$ 408
Unrealized Losses	$ 24	$ 4
Total Number of Positions | position	238	146
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 208	$ 166
Unrealized Losses	$ 9	$ 1
Total Number of Positions | security	99	75
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 97	$ 69
Unrealized Losses	$ 6	$ 1
Total Number of Positions | security	120	61
Other
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 25	$ 0
Unrealized Losses	$ 1	$ 0
Total Number of Positions | security	10	0

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

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