Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Debt (Junior subordinated notes) (Details)

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Debt (Junior subordinated notes) (Details) - USD ($)
$ in Thousands
1 Months Ended
Oct. 31, 2019
Jun. 30, 2015
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Debt     $ 29,486,131 $ 29,507,587
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%