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	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Changes in the allowance for losses on Mortgage and other loans receivable
Allowance, beginning of period	$ 603	$ 701	$ 629	$ 814
Loans charged off	0	(2)	(4)	(2)
Net charge-offs	0	(2)	(4)	(2)
Addition to (release of) allowance for loan losses	52	(27)	30	(140)
Reclassified to held for sale	0	(31)	0	(31)
Allowance, end of period	655	641	655	641
Loans modified in a troubled debt restructuring	220	45	220	45
Commercial mortgage loans
Changes in the allowance for losses on Mortgage and other loans receivable
Allowance, beginning of period	525	587	545	685
Loans charged off	0	(2)	(4)	(2)
Net charge-offs	0	(2)	(4)	(2)
Addition to (release of) allowance for loan losses	39	(28)	23	(126)
Reclassified to held for sale	0	0	0	0
Allowance, end of period	564	557	564	557
Off-balance-sheet commitments	87	83	87	83	$ 71
Other loans
Changes in the allowance for losses on Mortgage and other loans receivable
Allowance, beginning of period	78	114	84	129
Loans charged off	0	0	0	0
Net charge-offs	0	0	0	0
Addition to (release of) allowance for loan losses	13	1	7	(14)
Reclassified to held for sale	0	(31)	0	(31)
Allowance, end of period	$ 91	$ 84	$ 91	$ 84

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

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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)
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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
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-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
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-Paragraph 13
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- Definition

Amount, excluding accrued interest, of reversal of credit loss expense on financing receivable transferred out of held-for-investment into held-for-sale classification. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of financing receivable modified as troubled debt restructuring.

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-Publisher FASB
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-SubTopic 10
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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

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-Publisher FASB
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247

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