Clearing Operations - Separate Cash Accounts (Details) € in Millions, £ in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2020	Sep. 30, 2020 USD ($)	Sep. 30, 2020 EUR (€)	Sep. 30, 2020 GBP (£)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 GBP (£)
Clearing Organizations [Line Items]
Cash deposits		$ 85,900			$ 64,987
Cash Deposit Based On Euro/US Dollar Exchange Rate | De Nederlandsche Bank | ICE Clear Europe
Clearing Organizations [Line Items]
Cash deposits		$ 7,800	€ 6,600		9,000	€ 8,000
Exchange rate to USD	1.1212	1.1721
Cash Deposit Based On Euro/US Dollar Exchange Rate | Bank of England | ICE Clear Europe
Clearing Organizations [Line Items]
Cash deposits		$ 12	€ 10		11	€ 10
Cash Deposit Based On Pound Sterling/US Dollar Exchange Rate | Bank of England | ICE Clear Europe
Clearing Organizations [Line Items]
Cash deposits		$ 2,600		£ 2,000	663		£ 500
Exchange rate to USD	1.3260	1.2923
National Bank Account | ICE Clear Europe
Clearing Organizations [Line Items]
Cash deposits		$ 10,355			9,667
National Bank Account | ICE Clear Credit
Clearing Organizations [Line Items]
Cash deposits		31,924			19,480
Reverse repo | ICE Clear Europe
Clearing Organizations [Line Items]
Cash deposits		25,328			19,187
Reverse repo | ICE Clear Credit
Clearing Organizations [Line Items]
Cash deposits		4,630			2,411
Reverse repo | ICE Clear U.S.
Clearing Organizations [Line Items]
Cash deposits		4,849			4,320
Sovereign Debt | ICE Clear Europe
Clearing Organizations [Line Items]
Cash deposits		3,226			3,591
Sovereign Debt | ICE Clear U.S.
Clearing Organizations [Line Items]
Cash deposits		1,500			2,945
Demand deposits | ICE Clear Europe
Clearing Organizations [Line Items]
Cash deposits		4			17
Demand deposits | ICE Clear Credit
Clearing Organizations [Line Items]
Cash deposits		3,520			2,522
Demand deposits | Other ICE Clearing Houses
Clearing Organizations [Line Items]
Cash deposits		9			7
Unsettled Variation Margin and Delivery Contracts Receivable/Payable | ICE NGX
Clearing Organizations [Line Items]
Cash deposits		$ 555			$ 840