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Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Derivative Assets, Fair Value, Net [Abstract]      
Derviative contracts, net of cash collateral, Assets, Fair value $ 349,481 $ 220,502 $ 352,559
Derivative Liabilities, Fair Value, Net [Abstract]      
Derivative Liabilities, Fair Value, Net of Cash Collateral 252,387 171,963 336,327
Not Designated as Hedging Instrument [Member]      
Notional Amount of Derivatives [Abstract]      
Derivative Assets, Notional 16,964,723 [1] 20,038,522 [2] 28,952,817 [3]
Derivative Liabilities, Notional 19,689,316 [1] 20,186,467 [2] 26,144,409 [3]
Derivative Assets, Fair Value, Net [Abstract]      
Derivative Assets, Gross Fair Value 470,003 301,052 402,422
Derivative Assets, Netting Adjustments (103,535) (74,022) (45,885)
Derivative Assets, Net Fair Value Before Cash Collateral 366,468 227,030 356,537
Derivative Assets, Cash Collateral (16,987) (6,528) (3,978)
Derviative contracts, net of cash collateral, Assets, Fair value 349,481 220,502 352,559
Derivative Liabilities, Fair Value, Net [Abstract]      
Derivative Liabilities, Gross Fair Value 475,005 302,405 400,580
Derivative Liabilities, Netting Adjustments (103,535) (74,022) (45,885)
Derivative Liabilities, Net Fair Value Before Cash Collateral 371,470 228,383 354,695
Derivative Liabilities, Cash Collateral (119,083) (56,420) (18,368)
Derivative Liabilities, Fair Value, Net of Cash Collateral 252,387 171,963 336,327
Not Designated as Hedging Instrument [Member] | Total customer risk management programs      
Notional Amount of Derivatives [Abstract]      
Derivative Assets, Notional 15,900,610 [1] 15,301,821 [2] 17,011,557 [3]
Derivative Liabilities, Notional 15,610,222 [1] 14,458,046 [2] 16,963,878 [3]
Derivative Assets, Fair Value, Net [Abstract]      
Derivative Assets, Gross Fair Value 446,116 291,558 367,788
Derivative Assets, Netting Adjustments (87,445) (66,929) (45,885)
Derivative Assets, Net Fair Value Before Cash Collateral 358,671 224,629 321,903
Derivative Assets, Cash Collateral (16,987) (6,528) (3,978)
Derviative contracts, net of cash collateral, Assets, Fair value 341,684 218,101 317,925
Derivative Liabilities, Fair Value, Net [Abstract]      
Derivative Liabilities, Gross Fair Value 438,485 280,643 357,390
Derivative Liabilities, Netting Adjustments (87,445) (66,929) (45,885)
Derivative Liabilities, Net Fair Value Before Cash Collateral 351,040 213,714 311,505
Derivative Liabilities, Cash Collateral (119,083) (56,420) (18,368)
Derivative Liabilities, Fair Value, Net of Cash Collateral 231,957 157,294 293,137
Not Designated as Hedging Instrument [Member] | To-be-announced residential mortgage-backed securities [Member]      
Notional Amount of Derivatives [Abstract]      
Derivative Assets, Notional 12,423,155 [1] 12,347,542 [2] 14,244,442 [3]
Derivative Liabilities, Notional 12,160,590 [1] 11,537,742 [2] 14,244,442 [3]
Derivative Assets, Fair Value, Net [Abstract]      
Derivative Assets, Gross Fair Value 45,983 23,606 38,875
Derivative Assets, Netting Adjustments (18,338) (18,096) (9,547)
Derivative Assets, Net Fair Value Before Cash Collateral 27,645 5,510 29,328
Derivative Assets, Cash Collateral 0 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 27,645 5,510 29,328
Derivative Liabilities, Fair Value, Net [Abstract]      
Derivative Liabilities, Gross Fair Value 43,074 20,367 34,948
Derivative Liabilities, Netting Adjustments (18,338) (18,096) (9,547)
Derivative Liabilities, Net Fair Value Before Cash Collateral 24,736 2,271 25,401
Derivative Liabilities, Cash Collateral 0 (704) (374)
Derivative Liabilities, Fair Value, Net of Cash Collateral 24,736 1,567 25,027
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member]      
Notional Amount of Derivatives [Abstract]      
Derivative Assets, Notional 1,702,731 [1] 1,478,944 [2] 1,368,210 [3]
Derivative Liabilities, Notional 1,702,731 [1] 1,478,944 [2] 1,368,230 [3]
Derivative Assets, Fair Value, Net [Abstract]      
Derivative Assets, Gross Fair Value 46,160 28,278 27,016
Derivative Assets, Netting Adjustments (1,300) 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 44,860 28,278 27,016
Derivative Assets, Cash Collateral (13,307) (4,964) (2,820)
Derviative contracts, net of cash collateral, Assets, Fair value 31,553 23,314 24,196
Derivative Liabilities, Fair Value, Net [Abstract]      
Derivative Liabilities, Gross Fair Value 46,162 28,298 27,056
Derivative Liabilities, Netting Adjustments (1,300) 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 44,862 28,298 27,056
Derivative Liabilities, Cash Collateral (3,844) (12,896) (16,599)
Derivative Liabilities, Fair Value, Net of Cash Collateral 41,018 15,402 10,457
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]      
Notional Amount of Derivatives [Abstract]      
Derivative Assets, Notional 1,509,976 [1] 1,190,067 [2] 983,794 [3]
Derivative Liabilities, Notional 1,485,036 [1] 1,166,924 [2] 939,350 [3]
Derivative Assets, Fair Value, Net [Abstract]      
Derivative Assets, Gross Fair Value 202,086 103,044 45,368
Derivative Assets, Netting Adjustments (67,611) (47,873) (35,166)
Derivative Assets, Net Fair Value Before Cash Collateral 134,475 55,171 10,202
Derivative Assets, Cash Collateral (3,020) (196) (238)
Derviative contracts, net of cash collateral, Assets, Fair value 131,455 54,975 9,964
Derivative Liabilities, Fair Value, Net [Abstract]      
Derivative Liabilities, Gross Fair Value 200,290 101,603 42,744
Derivative Liabilities, Netting Adjustments (67,611) (47,873) (35,166)
Derivative Liabilities, Net Fair Value Before Cash Collateral 132,679 53,730 7,578
Derivative Liabilities, Cash Collateral (115,191) (42,767) 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 17,488 10,963 7,578
Not Designated as Hedging Instrument [Member] | Agricultural contracts [Member]      
Notional Amount of Derivatives [Abstract]      
Derivative Assets, Notional 26,318 [1] 53,238 [2] 60,745 [3]
Derivative Liabilities, Notional 26,316 [1] 48,552 [2] 60,746 [3]
Derivative Assets, Fair Value, Net [Abstract]      
Derivative Assets, Gross Fair Value 1,024 1,576 1,870
Derivative Assets, Netting Adjustments (196) (960) (1,172)
Derivative Assets, Net Fair Value Before Cash Collateral 828 616 698
Derivative Assets, Cash Collateral 0 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 828 616 698
Derivative Liabilities, Fair Value, Net [Abstract]      
Derivative Liabilities, Gross Fair Value 998 1,551 1,846
Derivative Liabilities, Netting Adjustments (196) (960) (1,172)
Derivative Liabilities, Net Fair Value Before Cash Collateral 802 591 674
Derivative Liabilities, Cash Collateral 0 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 802 591 674
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]      
Notional Amount of Derivatives [Abstract]      
Derivative Assets, Notional 148,824 [1] 132,397 [2] 252,525 [3]
Derivative Liabilities, Notional 145,943 [1] 126,251 [2] 249,269 [3]
Derivative Assets, Fair Value, Net [Abstract]      
Derivative Assets, Gross Fair Value 146,719 129,551 249,788
Derivative Assets, Netting Adjustments 0 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 146,719 129,551 249,788
Derivative Assets, Cash Collateral 0 (448) 0
Derviative contracts, net of cash collateral, Assets, Fair value 146,719 129,103 249,788
Derivative Liabilities, Fair Value, Net [Abstract]      
Derivative Liabilities, Gross Fair Value 143,817 123,321 245,925
Derivative Liabilities, Netting Adjustments 0 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 143,817 123,321 245,925
Derivative Liabilities, Cash Collateral (48) (53) (1,395)
Derivative Liabilities, Fair Value, Net of Cash Collateral 143,769 123,268 244,530
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]      
Notional Amount of Derivatives [Abstract]      
Derivative Assets, Notional 89,606 [1] 99,633 [2] 101,841 [3]
Derivative Liabilities, Notional 89,606 [1] 99,633 [2] 101,841 [3]
Derivative Assets, Fair Value, Net [Abstract]      
Derivative Assets, Gross Fair Value 4,144 5,503 4,871
Derivative Assets, Netting Adjustments 0 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 4,144 5,503 4,871
Derivative Assets, Cash Collateral (660) (920) (920)
Derviative contracts, net of cash collateral, Assets, Fair value 3,484 4,583 3,951
Derivative Liabilities, Fair Value, Net [Abstract]      
Derivative Liabilities, Gross Fair Value 4,144 5,503 4,871
Derivative Liabilities, Netting Adjustments 0 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 4,144 5,503 4,871
Derivative Liabilities, Cash Collateral 0 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 4,144 5,503 4,871
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]      
Notional Amount of Derivatives [Abstract]      
Derivative Assets, Notional 1,064,113 [1] 4,736,701 [2] 11,941,260 [3]
Derivative Liabilities, Notional 4,079,094 [1] 5,728,421 [2] 9,180,531 [3]
Derivative Assets, Fair Value, Net [Abstract]      
Derivative Assets, Gross Fair Value 23,887 9,494 34,634
Derivative Assets, Netting Adjustments (16,090) (7,093) 0
Derivative Assets, Net Fair Value Before Cash Collateral 7,797 2,401 34,634
Derivative Assets, Cash Collateral 0 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 7,797 2,401 34,634
Derivative Liabilities, Fair Value, Net [Abstract]      
Derivative Liabilities, Gross Fair Value 36,520 21,762 43,190
Derivative Liabilities, Netting Adjustments (16,090) (7,093) 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 20,430 14,669 43,190
Derivative Liabilities, Cash Collateral 0 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral $ 20,430 $ 14,669 $ 43,190
[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.
[3] Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.