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Credit Facilities (Narrative) (Details)			12 Months Ended
	May 26, 2016 USD ($)	Jun. 22, 2012 USD ($)	Dec. 31, 2020 GBP (£) Item Rate	Dec. 31, 2019 GBP (£) Rate	Dec. 31, 2020 USD ($) Rate	Mar. 25, 2020 USD ($)	Dec. 31, 2019 USD ($) Rate	Nov. 07, 2019 GBP (£)
Line of Credit Facility [Line Items]
Line of credit facility, number of facilities | Item			2
Line of credit facility, commitment			£ 52,175,000		$ 1,000,000,000
Borrowings from FHLB					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	$ 800,000,000			$ 800,000,000		800,000,000
Line of credit facility, required debt-to-capital ratio | Rate			35.00%		35.00%
Line of credit facility, required minimum net worth					$ 5,370,979,000
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					6,391,043,000
Revolving credit borrowings					753,932,000		623,484,000
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment					200,000,000
Revolving credit borrowings						$ 50,000,000	0
Wells Fargo Bank Group Credit Facility Tranche One [Member] | Federal Funds [Member]
Line of Credit Facility [Line Items]
Line of credit facility, spread on variable rate basis			0.50%
Wells Fargo Bank Group Credit Facility Tranche One [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Line of credit facility, spread on variable rate basis			1.00%
Wells Fargo Bank Group Credit Facility Tranche Two [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment					600,000,000
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility			15 months
Line of credit facility, commitment					200,000,000		200,000,000
Percentage of interest on the principal amount of letters of credit issued			0.35%
Percentage of interest on the principal amount of issued extended tenor letters of credit			0.45%
Maximum term allowed to execute issued letters of credit			60 months
Per annum commitment fee on undrawn credit			0.15%
Revolving credit borrowings					185,483,000		$ 147,970,000
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment | £			£ 52,175,000	£ 47,000,000				£ 52,175,000
Line of credit facility, required debt-to-capital ratio | Rate				35.00%			35.00%
Line of credit facility, required minimum net worth							$ 6,393,047,000
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					$ 6,527,996,000
Percentage commitment fee per annum			0.10%
Per annum commitment fee on undrawn credit			0.35%
Revolving credit borrowings | £			£ 52,175,000	£ 47,000,000
Federal Home Loan Bank Of New York [Member]
Line of Credit Facility [Line Items]
Maximum percentage of admitted assets allowed for borrowing base			10.00%		10.00%
Admitted assets for FHLB					$ 16,840,721,000
Maximum amount available under FHLB					1,684,072,000
Borrowings from FHLB					400,000,000
Revolving credit borrowings					$ 310,000,000
FHLB advance interest rate			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

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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 facilities, number of facilities.

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Maximum term allowed to execute issued letters of credit.

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

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Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants.

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Commitment based on the average daily amount of the remainder of (1) the aggregate amount available under the facility and (2) the aggregate amount of drawings outstanding under the facility

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Percentage Of Interest On The Principal Amount Of Issued Extended Tenor Letters Of Credit.

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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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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

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

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The lowest amount of net worth (total assets minus total liabilities) required by secondary market investors or state-imposed regulatory mandates.

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Indebtedness divided by net capital.

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