Lending Activities - Rollforward of the changes in the allowance for credit losses on Mortgage and other loans receivable (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Loans modified in a troubled debt restructuring		$ 77	$ 143	$ 280
Changes in the allowance for losses on Mortgage and other loans receivable
Allowance, beginning of period	$ 600	496	496	657	$ 357
Loans charged off	0	(5)	(13)	(1)	(17)
Net charge-offs	0	5	13	1	17
Addition to (release of) allowance for loan losses	59	(3)	117	(141)	43
Divestitures	0	0	0	(19)	0
Allowance, end of period	659	488	600	496	657
Off-balance-sheet commitments	54		60	57
Cumulative effect of change in accounting principle
Changes in the allowance for losses on Mortgage and other loans receivable
Allowance, beginning of period	0	0	0	274
Allowance, end of period			0	0	274
Commercial Mortgages
Changes in the allowance for losses on Mortgage and other loans receivable
Allowance, beginning of period	531	423	423	546	266
Loans charged off	0	(5)	(13)	(1)	(12)
Net charge-offs	0	5	13	1	12
Addition to (release of) allowance for loan losses	55	(5)	121	(122)	20
Divestitures	0	0		0	0
Allowance, end of period	586	413	531	423	546
Off-balance-sheet commitments	54	93	60	57	57
Commercial Mortgages \| Cumulative effect of change in accounting principle
Changes in the allowance for losses on Mortgage and other loans receivable
Allowance, beginning of period	0	0	0	272
Allowance, end of period			0	0	272
Other Loans
Changes in the allowance for losses on Mortgage and other loans receivable
Allowance, beginning of period	69	73	73	111	91
Loans charged off	0	0	0	0	(5)
Net charge-offs	0	0	0	0	5
Addition to (release of) allowance for loan losses	4	2	(4)	(19)	23
Divestitures	0	0	0	(19)	0
Allowance, end of period	73	75	69	73	111
Other Loans \| Cumulative effect of change in accounting principle
Changes in the allowance for losses on Mortgage and other loans receivable
Allowance, beginning of period	$ 0	$ 0	0	2
Allowance, end of period			$ 0	$ 0	$ 2

Financing Receivable, Excluding Accrued Interest, Allowance for Loan And Lease Losses Discontinued Operations

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- 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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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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- Definition

Amount, excluding accrued interest, of decrease (increase) in allowance for credit loss on financing receivable from writeoff (recovery). Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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- Definition

Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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- Definition

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446

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- References

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