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Derivatives (Narrative) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) MMBTU Boe company | Dec. 31, 2018 USD ($) MMBTU Boe company
Derivative [Line Items] |  |
Derivative liabilities - Fair Value | $ 256,528 | $ 118,305
Derivative assets - Fair value | 330,316 | 107,816
Credit-Risk-Related Contingent Features |  |
Derivative [Line Items] |  |
Derivative asset | 14,400 | 2,800
Derivative liability | 70,800 | 14,200
Associated posted collateral | 56,400 | 9,400
Aggregate fair value of derivative instruments in net liability position | 56,400 | 11,400
Derivative instruments designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional amount | 117,193 | 126,056
Derivative liabilities - Fair Value | 4,784 | 6,477
Derivative assets - Fair value | 0 | 0
Derivative instruments designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Notional amount | 86,167 | 90,245
Derivative liabilities - Fair Value | 1,586 | 611
Derivative assets - Fair value | 0 | 0
Derivative instruments designated as hedging instruments | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional amount | 31,026 | 35,811
Derivative liabilities - Fair Value | 3,198 | 5,866
Derivative assets - Fair value | 0 | 0
Derivative instruments not designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional amount | 20,540,031 | 15,222,341
Derivative liabilities - Fair Value | 251,744 | 111,828
Derivative assets - Fair value | 330,316 | 107,816
Derivative instruments not designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Notional amount | 4,839,661 | 3,407,522
Derivative liabilities - Fair Value | 47,024 | 19,329
Derivative assets - Fair value | 54,637 | 21,624
Derivative instruments not designated as hedging instruments | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional amount | 15,489,692 | 11,695,499
Derivative liabilities - Fair Value | 124,119 | 69,267
Derivative assets - Fair value | 192,883 | 69,818
Derivative instruments not designated as hedging instruments | Credit contracts |  |
Derivative [Line Items] |  |
Notional amount | 210,678 | 119,320
Derivative liabilities - Fair Value | 84 | 164
Derivative assets - Fair value | $ 2 | $ 1
Weighted average remaining maturity | 2 years 2 months 12 days | 6 years 7 months 6 days
Derivative instruments not designated as hedging instruments | Credit contracts | RPAs - protection sold |  |
Derivative [Line Items] |  |
Maximum exposure of RPAs with protection sold | $ 125 | $ 125
Derivative instruments not designated as hedging instruments | Equity, Private Companies |  |
Derivative [Line Items] |  |
Number of companies that Issued the equity contracts (Issuers Portion Only) | company | 18 | 18
Derivative instruments not designated as hedging instruments | Equity, Public Companies |  |
Derivative [Line Items] |  |
Number of companies that Issued the equity contracts (Issuers Portion Only) | company | 3 | 4
Derivative instruments not designated as hedging instruments | Equity warrants |  |
Derivative [Line Items] |  |
Notional amount | $ 0 | $ 0
Derivative liabilities - Fair Value | 0 | 0
Derivative assets - Fair value | 1,414 | 1,951
Derivative instruments not designated as hedging instruments | Commodity contracts |  |
Derivative [Line Items] |  |
Notional amount | 0 | 0
Derivative liabilities - Fair Value | 80,517 | 23,068
Derivative assets - Fair value | 81,380 | 14,422
Fair Value, Measurements, Recurring |  |
Derivative [Line Items] |  |
Derivative liabilities - Fair Value | 256,528 | 118,305
Derivative assets - Fair value | 330,316 | 107,816
Fair Value, Measurements, Recurring | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Derivative liabilities - Fair Value | 48,610 | 19,940
Derivative assets - Fair value | 54,637 | 21,624
Fair Value, Measurements, Recurring | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative liabilities - Fair Value | 127,317 | 75,133
Derivative assets - Fair value | 192,883 | 69,818
Fair Value, Measurements, Recurring | Credit contracts |  |
Derivative [Line Items] |  |
Derivative liabilities - Fair Value | 84 | 164
Derivative assets - Fair value | 2 | 1
Fair Value, Measurements, Recurring | Equity warrants |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 1,414 | 1,951
Fair Value, Measurements, Recurring | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative liabilities - Fair Value | 80,517 | 23,068
Derivative assets - Fair value | 81,380 | 14,422
Financial Counterparty | Derivative instruments not designated as hedging instruments | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional amount | 7,750,000 | 5,850,000
London Clearing House | Derivative instruments not designated as hedging instruments | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional amount | 2,530,000 | 1,660,000
Derivative liabilities - Fair Value | 75,100 | 16,000
Derivative assets - Fair value | 2,900 | 16,400
Chicago Mercantile Exchange (CME) | Derivative instruments not designated as hedging instruments | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative liabilities - Fair Value |  | 582
Derivative assets - Fair value | 2,900 | 10,400
Derivative liability | 1,500 |
Derivative assets (liabilities), at fair value | $ 986 | $ 622
Chicago Mercantile Exchange (CME) | Derivative instruments not designated as hedging instruments | Commodity contracts | Oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 1,752 | 778
Chicago Mercantile Exchange (CME) | Derivative instruments not designated as hedging instruments | Commodity contracts | Natural Gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 6,075 | 6,290

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