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Credit Facilities (Narrative) (Details)			3 Months Ended	9 Months Ended	12 Months Ended
	May 26, 2016 USD ($)	Jun. 22, 2012 USD ($)	Sep. 30, 2021 GBP (£) Item Rate	Sep. 30, 2021 GBP (£) Item Rate	Dec. 31, 2020 GBP (£)	Dec. 31, 2019	Sep. 30, 2021 USD ($) Item Rate	May 05, 2021 USD ($)	Feb. 23, 2021 USD ($)	Dec. 31, 2020 USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, commitment							$ 1,530,000,000.0
Uncommitted amount available							$ 140,000,000.0
Maximum percentage of admitted assets allowed for borrowing base			10.00%	10.00%			10.00%
Borrowings from FHLB							$ 310,000,000			$ 310,000,000
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility	5 years	4 years
Line of credit facility, commitment	$ 800,000,000.0	$ 800,000,000.0					$ 600,000,000			800,000,000
Line of credit facility, number of tranches | Item			2	2			2
Line of credit facility, required debt-to-capital ratio | Rate			35.00%	35.00%			35.00%
Line of credit facility, required minimum net worth							$ 5,371,000,000.0
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants				25.00%
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants				25.00%
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants							6,651,800,000
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date					Dec. 31, 2021
Line of credit facility, commitment										200,000,000.0
Wells Fargo Bank Group Credit Facility Tranche Two [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date				Dec. 31, 2021	Dec. 31, 2021
Line of credit facility, commitment							600,000,000.0			600,000,000
Wells Fargo Bank Bilateral Loc Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date				Dec. 31, 2021
Line of credit facility, commitment							500,000,000	$ 500,000,000.0	$ 50,000,000.0
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment							230,000,000			$ 200,000,000
Uncommitted amount available							$ 140,000,000.0
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment | £			£ 52,175,000	£ 52,175,000	£ 52,175,000
Line of credit facility, required debt-to-capital ratio | Rate			35.00%	35.00%			35.00%
Line of credit facility, required minimum net worth							$ 6,393,000,000.0
Consolidated net worth, percentage						70.00%
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants			25.00%
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants			25.00%
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants							6,788,700,000
Federal Home Loan Bank Of New York [Member]
Line of Credit Facility [Line Items]
Admitted assets for FHLB							18,874,000,000.0
Maximum amount available under FHLB							1,887,400,000
Borrowings from FHLB							$ 400,000,000.0
FHLB advance interest rate			0.35%	0.35%			0.35%
Amount of borrowed funds required to be used to acquire additional membership stock, percentage				4.50%
Federal Home Loan Bank Of New York [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
FHLB advance maturity				Nov. 30, 2021
Federal Home Loan Bank Of New York [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
FHLB advance maturity				Dec. 31, 2021
Bayerische Landesbank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment							$ 200,000,000

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Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants.

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Line Of Credit Facility, Number Of Tranches

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Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants.

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Interest rate of advances made and reported by Federal Home Loan Bank (FHLBank).

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Date the credit facility terminates, in CCYY-MM-DD format.

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Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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