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Derivatives (Narrative) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) Boe MMBTU company | Dec. 31, 2018 USD ($) Boe MMBTU company
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 358,639 | $ 107,816
Derivative liabilities - Fair value | 263,734 | 118,305
Credit-risk-related contingent features |  |
Derivative [Line Items] |  |
Aggregate fair value of derivative instruments in net liability position | 71,300 | 11,400
Derivative asset | 538 | 2,800
Derivative liability | 71,900 | 14,200
Collateral posted | 71,100 | 9,400
Derivative instruments designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional amount | 115,857 | 126,056
Derivative assets - Fair value | 0 | 0
Derivative liabilities - Fair value | 3,235 | 6,477
Derivative instruments designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Notional amount | 84,831 | 90,245
Derivative assets - Fair value | 0 | 0
Derivative liabilities - Fair value | 431 | 611
Derivative instruments designated as hedging instruments | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional amount | 31,026 | 35,811
Derivative assets - Fair value | 0 | 0
Derivative liabilities - Fair value | 2,804 | 5,866
Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional amount | 18,988,712 | 15,222,341
Derivative assets - Fair value | 358,639 | 107,816
Derivative liabilities - Fair value | 260,499 | 111,828
Derivatives not designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Notional amount | 4,638,136 | 3,407,522
Derivative assets - Fair value | 59,512 | 21,624
Derivative liabilities - Fair value | 50,397 | 19,329
Derivatives not designated as hedging instruments | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional amount | 14,139,233 | 11,695,499
Derivative assets - Fair value | 264,603 | 69,818
Derivative liabilities - Fair value | 168,113 | 69,267
Derivatives not designated as hedging instruments | Interest rate contracts | Financial Counterparty |  |
Derivative [Line Items] |  |
Notional amount | 7,070,000 | 5,850,000
Derivatives not designated as hedging instruments | Interest rate contracts | LCH |  |
Derivative [Line Items] |  |
Notional amount | 2,250,000 | 1,660,000
Derivative assets - Fair value | 317 | 16,400
Derivative liabilities - Fair value | 103,300 | 16,000
Derivatives not designated as hedging instruments | Credit contracts |  |
Derivative [Line Items] |  |
Notional amount | 211,343 | 119,320
Derivative assets - Fair value | 4 | 1
Derivative liabilities - Fair value | $ 122 | $ 164
Weighted average remaining maturity of outstanding RPAs | 2 years 4 months 24 days | 6 years 7 months 6 days
Derivatives not designated as hedging instruments | Credit contracts | RPA protection sold |  |
Derivative [Line Items] |  |
Maximum exposure of RPAs with protection sold | $ 117 | $ 125
Derivatives not designated as hedging instruments | Equity, Public Companies |  |
Derivative [Line Items] |  |
Number of companies that issued the equity (issuers portion only) | company | 3 | 4
Derivatives not designated as hedging instruments | Equity, Private Companies |  |
Derivative [Line Items] |  |
Number of companies that issued the equity (issuers portion only) | company | 17 | 18
Derivatives not designated as hedging instruments | Equity contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 0 | $ 0
Derivative assets - Fair value | 1,542 | 1,951
Derivative liabilities - Fair value | 0 | 0
Derivatives not designated as hedging instruments | Commodity contracts |  |
Derivative [Line Items] |  |
Notional amount | 0 | 0
Derivative assets - Fair value | 32,978 | 14,422
Derivative liabilities - Fair value | 41,867 | 23,068
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME) |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 13,200 | 10,400
Derivative liabilities - Fair value |  | 582
Derivative assets (liabilities), at fair value, net | $ 3,000 | $ 622
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME) | Oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 2,160 | 778
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME) | Natural gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 3,980 | 6,290
Maximum | Derivatives not designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Original maturity (in years) | 1 year | 1 year

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