Financing Receivables - General Credit Quality Information - Commercial Mortgage Loans (Details) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Commercial Loans \| Commercial mortgage loans
Financing Receivables
Loans	$ 1,901	$ 2,725
Commercial Loans \| Commercial mortgage loans \| Past due
Financing Receivables
Loans	$ 0	$ 0
Commercial Loans \| Commercial mortgage loans \| COVID 19 loan modifications
Financing Receivables
Total number of loan modifications \| loan		93
Total unpaid principal balance of loan modifications		$ 369
Number of modified loans remaining \| loan	0
Total commercial mortgage loans \| Credit concentration risk \| Commercial Loans \| Commercial mortgage loans
Financing Receivables
Percentage of total	100.00%	100.00%
Total commercial mortgage loans \| Credit concentration risk \| Highest credit risk rating \| Maximum
Financing Receivables
Percentage of total	1.00%	1.00%

Represents the cumulative number of financing receivables that have been modified.

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- Definition

Number of modified financing receivables remaining.

+ References

No definition available.

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- Definition

Cumulative unpaid principal balance of financing receivable modified on trial basis.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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- Definition

Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

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