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Investments - Allowance for Credit Losses Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	$ 503	$ 488	$ 459	$ 311
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	12	43	38	222
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	11	1	39	1
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	(4)	(9)	(14)	(17)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	0	106	0	112
Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	502	468	458	311
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	11	42	37	201
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	11	1	39	1
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	(4)	(9)	(14)	(17)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	1	107	1	113
Related Party
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	1	20	1	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	1	1	1	21
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	(1)	(1)	(1)	(1)
Foreign governments | Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	27	66	27	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	0	0	0	66
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	0	(5)	0	(5)
Corporate | Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	79	55	61	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	0	6	21	61
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	0	0	(6)	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	(6)	9	(3)	9
Corporate | Related Party
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance			0
CLO | Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	4	18	7	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	0	4	1	22
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	(1)	85	(5)	85
CLO | Related Party
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	1	3	1	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	0	0	0	3
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	(1)	16	(1)	16
ABS | Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	31	11	29	5
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	1	4	1	9
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	3	(1)	5	0
ABS | Related Party
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	0	17	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	1	1	1	18
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	0	(17)	0	(17)
CMBS | Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	5	6	5	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	2	8	3	14
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	0	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	(1)	(5)	(2)	(5)
RMBS | Consolidated Entity, excluding Affiliated Entity
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	356	312	329	306
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	8	20	11	29
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase	11	1	39	1
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	(4)	(9)	(8)	(17)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	$ 6	$ 24	$ 6	$ 29

X

- Definition

Amount of allowance for credit loss 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://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-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

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-9

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-9

+ Details

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X

- Definition

Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-9

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X

- Definition

Amount of expense (reversal of expense) for allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-9

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X

- Definition

Amount of increase in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and beneficial interest, purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-9

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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X

- Definition

Amount of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-9

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