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Derivatives (Narrative) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) Boe MMBTU company | Dec. 31, 2019 USD ($) MMBTU Boe company
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 764,430 | $ 330,316
Derivative liabilities - Fair value | 560,169 | 256,528
Credit-risk-related contingent features |  |
Derivative [Line Items] |  |
Aggregate fair value of derivative instruments in net liability position | 136,600 | 56,400
Derivative asset |  | 14,400
Derivative liability |  | 70,800
Collateral posted | 136,500 | 56,400
Derivative instruments designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional amount | 367,883 | 117,193
Derivative assets - Fair value | 245 | 0
Derivative liabilities - Fair value | 1,657 | 4,784
Derivative instruments designated as hedging instruments | Interest rate contracts | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Notional amount | 275,000 | 0
Net unrealized gains, net of tax, recorded in AOCI expected to be reclassified into earnings during next 12 months | 183 |
Derivative assets - Fair value | 0 | 0
Derivative liabilities - Fair value | 1,483 | 0
Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional amount | 20,113,400 | 20,540,031
Derivative assets - Fair value | 764,185 | 330,316
Derivative liabilities - Fair value | 558,512 | 251,744
Derivatives not designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Notional amount | 2,738,018 | 4,839,661
Derivative assets - Fair value | 24,044 | 54,637
Derivative liabilities - Fair value | 19,741 | 47,024
Derivatives not designated as hedging instruments | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional amount | 17,170,884 | 15,489,692
Derivative assets - Fair value | 613,480 | 192,883
Derivative liabilities - Fair value | 400,146 | 124,119
Derivatives not designated as hedging instruments | Interest rate contracts | Financial Counterparty |  |
Derivative [Line Items] |  |
Notional amount | 8,600,000 | 7,750,000
Derivatives not designated as hedging instruments | Interest rate contracts | LCH |  |
Derivative [Line Items] |  |
Notional amount | 2,820,000 | 2,530,000
Derivative assets - Fair value |  | 2,900
Derivative liabilities - Fair value | 229,800 | 75,100
Derivatives not designated as hedging instruments | Credit contracts |  |
Derivative [Line Items] |  |
Notional amount | 204,498 | 210,678
Derivative assets - Fair value | 41 | 2
Derivative liabilities - Fair value | $ 327 | $ 84
Weighted average remaining maturity of outstanding RPAs | 1 year 8 months 12 days | 2 years 2 months 12 days
Derivatives not designated as hedging instruments | Credit contracts | RPA protection sold |  |
Derivative [Line Items] |  |
Maximum exposure of RPAs with protection sold | $ 778 | $ 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 | 3
Derivatives not designated as hedging instruments | Equity contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 0 | $ 0
Derivative assets - Fair value | 9,173 | 1,414
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 | 117,447 | 81,380
Derivative liabilities - Fair value | 138,298 | 80,517
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME) |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 25,000 | 2,900
Derivative liabilities - Fair value | 631 | 1,500
Derivative assets (liabilities), at fair value, net | $ 2,300 | $ 986
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME) | Oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 1,532 | 1,752
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME) | Natural gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 24,895 | 6,075
Maximum | Derivatives not designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Original maturity (in years) | 1 year | 1 year
Derivative Financial Instruments, Assets | Derivative instruments designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 245 |
Derivative Financial Instruments, Liabilities | Derivative instruments designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 77,700 | $ 86,200
Derivative liabilities - Fair value |  | $ 1,600

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