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Derivatives (Narrative) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) Boe MMBTU company | Dec. 31, 2020 USD ($) Boe MMBTU company
Derivative [Line Items] |  |
Derivative liabilities - Fair Value | $ 390,171 | $ 424,828
Derivative assets - Fair value | $ 484,184 | $ 602,754
Foreign exchange contracts |  |
Derivative [Line Items] |  |
Original maturity (in years) | 1 year | 1 year
Credit-Risk-Related Contingent Features |  |
Derivative [Line Items] |  |
Associated posted collateral | $ 66,600 | $ 106,800
Aggregate fair value of derivative instruments in net liability position | 66,800 | 107,400
Derivative instruments designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional amount | 361,531 | 359,269
Derivative liabilities - Fair Value | 282 | 2,099
Derivative assets - Fair value | 0 | 0
Derivative instruments designated as hedging instruments | Interest rate contracts | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Notional amount | 275,000 | 275,000
Net unrealized gains, net of tax, recorded in AOCI expected to be reclassified into earnings during the next 12 months | 28 |
Derivative liabilities - Fair Value | 57 | 1,864
Derivative assets - Fair value | 0 | 0
Derivative instruments designated as hedging instruments | Interest rate contracts | Fair Value Hedging |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 0 | 0
Derivative instruments not designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional amount | 19,522,661 | 21,341,158
Derivative liabilities - Fair Value | 389,889 | 422,729
Derivative assets - Fair value | 484,184 | 602,754
Derivative instruments not designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Notional amount | 1,874,681 | 3,108,488
Derivative liabilities - Fair Value | 15,276 | 22,524
Derivative assets - Fair value | 21,033 | 30,300
Derivative instruments not designated as hedging instruments | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional amount | 17,575,420 | 18,155,678
Derivative liabilities - Fair Value | 179,905 | 315,834
Derivative assets - Fair value | 240,222 | 489,132
Derivative instruments not designated as hedging instruments | Credit contracts |  |
Derivative [Line Items] |  |
Notional amount | 72,560 | 76,992
Derivative liabilities - Fair Value | 141 | 206
Derivative assets - Fair value | $ 0 | $ 13
Weighted average remaining maturity of outstanding RPAs | 3 years 2 months 12 days | 3 years 6 months
Derivative instruments not designated as hedging instruments | Credit contracts | RPAs - protection sold |  |
Derivative [Line Items] |  |
Maximum exposure of RPAs with protection sold | $ 3,200 | $ 6,000
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 | 12 | 17
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 | 1 | 2
Derivative instruments not designated as hedging instruments | Equity contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 0 | $ 0
Derivative liabilities - Fair Value | 0 | 0
Derivative assets - Fair value | 220 | 858
Derivative instruments not designated as hedging instruments | Commodity contracts |  |
Derivative [Line Items] |  |
Notional amount | 0 | 0
Derivative liabilities - Fair Value | 194,567 | 84,165
Derivative assets - Fair value | 222,709 | 82,451
Financial Counterparty | Derivative instruments not designated as hedging instruments | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional amount | 8,800,000 | 9,090,000
London Clearing House | Derivative instruments not designated as hedging instruments | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional amount | 2,790,000 | 2,980,000
Derivative liabilities - Fair Value | 79,900 | 187,400
Derivative assets - Fair value | 18,100 | 1,300
Chicago Mercantile Exchange (CME) | Derivative instruments not designated as hedging instruments | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative liabilities - Fair Value | 25,800 | 3,700
Derivative assets - Fair value | $ 2,200 | $ 7,900
Chicago Mercantile Exchange (CME) | Derivative instruments not designated as hedging instruments | Commodity contracts | Oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 1,036 | 1,275
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 | 11,490 | 29,733

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