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Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Fair Value, Net of Cash Collateral $ 320,929 $ 220,502
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Fair Value, Net of Cash Collateral 362,306 171,963
Not Designated as Hedging Instrument [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 30,272,764 [1] 20,038,522 [2]
Derivative Liabilities, Notional 33,838,893 [1] 20,186,467 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 571,793 301,052
Derivative Assets, Netting Adjustments (135,530) (74,022)
Derivative Assets, Net Fair Value Before Cash Collateral 436,263 227,030
Derivative Assets, Cash Collateral (115,334) (6,528)
Derivative Assets, Fair Value, Net of Cash Collateral 320,929 220,502
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 574,347 302,405
Derivative Liabilities, Netting Adjustments (135,530) (74,022)
Derivative Liabilities, Net Fair Value Before Cash Collateral 438,817 228,383
Derivative Liabilities, Cash Collateral (76,511) (56,420)
Derivative Liabilities, Fair Value, Net of Cash Collateral 362,306 171,963
Not Designated as Hedging Instrument [Member] | Total customer risk management programs [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 14,362,776 [1] 15,301,821 [2]
Derivative Liabilities, Notional 14,204,251 [1] 14,458,046 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 521,383 291,558
Derivative Assets, Netting Adjustments (94,659) (66,929)
Derivative Assets, Net Fair Value Before Cash Collateral 426,724 224,629
Derivative Assets, Cash Collateral (115,334) (6,528)
Derivative Assets, Fair Value, Net of Cash Collateral 311,390 218,101
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 507,925 280,643
Derivative Liabilities, Netting Adjustments (94,659) (66,929)
Derivative Liabilities, Net Fair Value Before Cash Collateral 413,266 213,714
Derivative Liabilities, Cash Collateral (69,196) (56,420)
Derivative Liabilities, Fair Value, Net of Cash Collateral 344,070 157,294
Not Designated as Hedging Instrument [Member] | To-be-announced residential mortgage-backed securities [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 10,671,151 [1] 12,347,542 [2]
Derivative Liabilities, Notional 10,558,151 [1] 11,537,742 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 92,231 23,606
Derivative Assets, Netting Adjustments (26,787) (18,096)
Derivative Assets, Net Fair Value Before Cash Collateral 65,444 5,510
Derivative Assets, Cash Collateral 0 0
Derivative Assets, Fair Value, Net of Cash Collateral 65,444 5,510
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 90,388 20,367
Derivative Liabilities, Netting Adjustments (26,787) (18,096)
Derivative Liabilities, Net Fair Value Before Cash Collateral 63,601 2,271
Derivative Liabilities, Cash Collateral (63,596) (704)
Derivative Liabilities, Fair Value, Net of Cash Collateral 5 1,567
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 1,924,131 [1] 1,478,944 [2]
Derivative Liabilities, Notional 1,924,131 [1] 1,478,944 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 36,112 28,278
Derivative Assets, Netting Adjustments (6,688) 0
Derivative Assets, Net Fair Value Before Cash Collateral 29,424 28,278
Derivative Assets, Cash Collateral (7,934) (4,964)
Derivative Assets, Fair Value, Net of Cash Collateral 21,490 23,314
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 36,288 28,298
Derivative Liabilities, Netting Adjustments (6,688) 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 29,600 28,298
Derivative Liabilities, Cash Collateral (4,110) (12,896)
Derivative Liabilities, Fair Value, Net of Cash Collateral 25,490 15,402
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 1,472,209 [1] 1,190,067 [2]
Derivative Liabilities, Notional 1,434,247 [1] 1,166,924 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 206,418 103,044
Derivative Assets, Netting Adjustments (60,983) (47,873)
Derivative Assets, Net Fair Value Before Cash Collateral 145,435 55,171
Derivative Assets, Cash Collateral (106,752) (196)
Derivative Assets, Fair Value, Net of Cash Collateral 38,683 54,975
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 202,494 101,603
Derivative Liabilities, Netting Adjustments (60,983) (47,873)
Derivative Liabilities, Net Fair Value Before Cash Collateral 141,511 53,730
Derivative Liabilities, Cash Collateral (1,490) (42,767)
Derivative Liabilities, Fair Value, Net of Cash Collateral 140,021 10,963
Not Designated as Hedging Instrument [Member] | Agricultural contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 21,210 [1] 53,238 [2]
Derivative Liabilities, Notional 21,214 [1] 48,552 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 842 1,576
Derivative Assets, Netting Adjustments (201) (960)
Derivative Assets, Net Fair Value Before Cash Collateral 641 616
Derivative Assets, Cash Collateral 0 0
Derivative Assets, Fair Value, Net of Cash Collateral 641 616
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 812 1,551
Derivative Liabilities, Netting Adjustments (201) (960)
Derivative Liabilities, Net Fair Value Before Cash Collateral 611 591
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 611 591
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 184,990 [1] 132,397 [2]
Derivative Liabilities, Notional 177,423 [1] 126,251 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 183,759 129,551
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 183,759 129,551
Derivative Assets, Cash Collateral 0 (448)
Derivative Assets, Fair Value, Net of Cash Collateral 183,759 129,103
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 175,922 123,321
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 175,922 123,321
Derivative Liabilities, Cash Collateral 0 (53)
Derivative Liabilities, Fair Value, Net of Cash Collateral 175,922 123,268
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 89,085 [1] 99,633 [2]
Derivative Liabilities, Notional 89,085 [1] 99,633 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 2,021 5,503
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 2,021 5,503
Derivative Assets, Cash Collateral (648) (920)
Derivative Assets, Fair Value, Net of Cash Collateral 1,373 4,583
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 2,021 5,503
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 2,021 5,503
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 2,021 5,503
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 15,909,988 [1] 4,736,701 [2]
Derivative Liabilities, Notional 19,634,642 [1] 5,728,421 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 50,410 9,494
Derivative Assets, Netting Adjustments (40,871) (7,093)
Derivative Assets, Net Fair Value Before Cash Collateral 9,539 2,401
Derivative Assets, Cash Collateral 0 0
Derivative Assets, Fair Value, Net of Cash Collateral 9,539 2,401
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 66,422 21,762
Derivative Liabilities, Netting Adjustments (40,871) (7,093)
Derivative Liabilities, Net Fair Value Before Cash Collateral 25,551 14,669
Derivative Liabilities, Cash Collateral (7,315) 0
Derivative Liabilities, Fair Value, Net of Cash Collateral $ 18,236 $ 14,669
[1] Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.
[2] Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.