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Derivatives (Narrative) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) Boe MMBTU company | Dec. 31, 2019 USD ($) MMBTU Boe company
Derivative [Line Items] |  |
Derivative liabilities - Fair value | $ 506,019 | $ 256,528
Derivative assets - Fair value | 708,610 | 330,316
Credit-risk-related contingent features |  |
Derivative [Line Items] |  |
Aggregate fair value of derivative instruments in net liability position | 126,400 | 56,400
Derivative asset |  | 14,400
Derivative liability |  | 70,800
Collateral posted | 126,300 | 56,400
Derivative instruments designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional amount | 371,186 | 117,193
Derivative liabilities - Fair value | 2,113 | 4,784
Derivative assets - Fair value | 64 | 0
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 | 536 |
Derivative liabilities - Fair value | 1,861 | 0
Derivative assets - Fair value | 0 | 0
Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional amount | 19,523,762 | 20,540,031
Derivative liabilities - Fair value | 503,906 | 251,744
Derivative assets - Fair value | 708,546 | 330,316
Derivatives not designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Notional amount | 1,832,383 | 4,839,661
Derivative liabilities - Fair value | 14,530 | 47,024
Derivative assets - Fair value | 19,134 | 54,637
Derivatives not designated as hedging instruments | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional amount | 17,613,982 | 15,489,692
Derivative liabilities - Fair value | 370,196 | 124,119
Derivative assets - Fair value | 566,571 | 192,883
Derivatives not designated as hedging instruments | Interest rate contracts | Financial Counterparty |  |
Derivative [Line Items] |  |
Notional amount | 8,820,000 | 7,750,000
Derivatives not designated as hedging instruments | Interest rate contracts | LCH |  |
Derivative [Line Items] |  |
Notional amount | 2,990,000 | 2,530,000
Derivative liabilities - Fair value | 215,900 | 75,100
Derivative assets - Fair value |  | 2,900
Derivatives not designated as hedging instruments | Credit contracts |  |
Derivative [Line Items] |  |
Notional amount | 77,397 | 210,678
Derivative liabilities - Fair value | 307 | 84
Derivative assets - Fair value | $ 47 | $ 2
Weighted average remaining maturity of outstanding RPAs | 4 years | 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 | $ 748 | $ 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 liabilities - Fair value | 0 | 0
Derivative assets - Fair value | 12,765 | 1,414
Derivatives not designated as hedging instruments | Commodity contracts |  |
Derivative [Line Items] |  |
Notional amount | 0 | 0
Derivative liabilities - Fair value | 118,873 | 80,517
Derivative assets - Fair value | 110,029 | 81,380
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME) |  |
Derivative [Line Items] |  |
Derivative liabilities - Fair value | 6,600 | 1,500
Derivative assets - Fair value | 17,800 | 2,900
Derivative assets (liabilities), at fair value, net | $ 0 | $ 986
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME) | Oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 1,506 | 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 | 31,395 | 6,075
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
Maximum | Derivatives not designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Original maturity (in years) | 1 year | 1 year
Derivative Financial Instruments, Liabilities | Derivative instruments designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 81,000 | $ 86,200
Derivative liabilities - Fair value | $ 252 | $ 1,600

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