Financing Receivables - Credit Quality Information (Details) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2021 USD ($) loan	Mar. 31, 2020 loan	Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications \| loan	0	0
Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans	$ 12		$ 21
Commercial mortgage loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans	$ 0		$ 0
Percentage of commercial mortgage loans with highest risk rating less than %	1.00%		1.00%
Total loans, gross	$ 2,691		$ 2,725
Loan modifications \| loan			93
Loan modifications during period			$ 369
Number of modified loans outstanding \| loan	1
Modified loans outstanding	$ 10
Syndicated loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans	0		3
Total loans, gross	561		595
Loans to financial advisors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 722		$ 715

Number of outstanding financing receivables that have been modified by troubled debt restructurings.

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Represents the percentage of commercial mortgage loans that the company has assigned its highest risk rating.

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Number of financing receivables that have been modified by troubled debt restructurings.

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Amount, before troubled debt restructuring, of financing receivable to be modified.

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Amount of financing receivable modified as troubled debt restructuring.

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Amount of financing receivable past due.

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Amount, before allowance for credit loss, of financing receivable.

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