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Debt (Junior subordinated notes) (Details) - USD ($) $ in Thousands	1 Months Ended
	Oct. 31, 2019	Jun. 30, 2015	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt			$ 28,742,081	$ 29,486,131
Subordinated | Junior Subordinated Notes
Debt Instrument [Line Items]
Debt	$ 750,000	$ 500,000
Debt, fixed interest rate	5.875%	6.50%
Debt instrument term deferral period		5 years
LIBOR | Subordinated | Junior Subordinated Notes
Debt Instrument [Line Items]
Spread over reference rate		4.30%
US Treasury (UST) Interest Rate | Subordinated | Junior Subordinated Notes
Debt Instrument [Line Items]
Spread over reference rate	4.535%

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Debt Instrument, Term, Deferral, Payment Period

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

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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