Customer Deposits - Investment Certificates (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Investment Certificates
Amount of reserves that do not allow for a surrender charge	$ 2,700,000,000	$ 3,200,000,000
Percentage of participation in the market index in the first option	100.00%
Percentage of participation in the market index in the second option	25.00%
Minimum
Investment Certificates
Amount of fixed rate investment certificates	$ 1,000
Term of fixed rate investment certificates	3 months
Returns on current first term stock market certificates (as a percent)	0.00%
Maximum
Investment Certificates
Amount of fixed rate investment certificates	$ 2,000,000
Term of fixed rate investment certificates	36 months
Returns on current first term stock market certificates (as a percent)	2.35%

Represents the amount of fixed rate investment certificates offered by the entity.

No definition available.

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- Definition

Amount of reserves that do not allow for a surrender charge.

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- Definition

Period of time between issuance and maturity of investment certificates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Represents the percentage of participation in the market index in the first option for increases in the stock market based on the S and P 500 Index.

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No definition available.

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- Definition

Represents the percentage of participation in the market index in the second option for increases in the stock market based on the S and P 500 Index.

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No definition available.

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- Definition

Represents the maximum percentage of returns on the current first term stock market certificates.

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No definition available.

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