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Debt (ECAPS subordinated notes) (Details) - USD ($) | 1 Months Ended
--- | ---
Oct. 31, 2019 | Jun. 30, 2015 | Dec. 31, 2005
Debt Instrument [Line Items] |  |  |
Debt, floating reference rate, duration | 5 years | 3 months |
Subordinated | ECAPS Subordinated Notes |  |  |
Debt Instrument [Line Items] |  |  |
Number of tranches |  |  | 2
Face amount |  |  | $ 1,000,000,000
Subordinated | ECAPS Subordinated Notes | Three Month LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Debt, floating reference rate, duration |  |  | 3 months
Subordinated | ECAPS Subordinated Notes | Ten Year Constant Maturity U.S. Treasury |  |  |
Debt Instrument [Line Items] |  |  |
Debt, floating reference rate, duration |  |  | 10 years
Subordinated | ECAPS Subordinated Notes | Thirty Year Constant Maturity U.S. Treasury |  |  |
Debt Instrument [Line Items] |  |  |
Debt, floating reference rate, duration |  |  | 30 years
Subordinated | ECAPS Subordinated Debt $400 Million Tranche |  |  |
Debt Instrument [Line Items] |  |  |
Face amount |  |  | $ 400,000,000
Spread over reference rate |  |  | 1.80%
Subordinated | ECAPS Subordinated Debt $600 Million Tranche |  |  |
Debt Instrument [Line Items] |  |  |
Face amount |  |  | $ 600,000,000
Spread over reference rate |  |  | 1.55%

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