Clearing Operations - Separate Cash Accounts (Details) € in Millions, £ in Millions, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2019 GBP (£)	Jun. 30, 2019 EUR (€)	Dec. 31, 2018 GBP (£)	Dec. 31, 2018 EUR (€)
Clearing Organizations [Line Items]
Cash deposits	$ 61,353	$ 63,955
National Bank Account | ICE Clear Europe
Clearing Organizations [Line Items]
Cash deposits	4,112	8,647
National Bank Account | ICE Clear Credit
Clearing Organizations [Line Items]
Cash deposits	18,606	19,484
Reverse repo | ICE Clear Europe
Clearing Organizations [Line Items]
Cash deposits	22,087	18,097
Reverse repo | ICE Clear Credit
Clearing Organizations [Line Items]
Cash deposits	2,786	1,935
Reverse repo | ICE Clear US
Clearing Organizations [Line Items]
Cash deposits	5,254	4,380
Sovereign Debt | ICE Clear Europe
Clearing Organizations [Line Items]
Cash deposits	3,340	4,035
Demand deposits | ICE Clear Europe
Clearing Organizations [Line Items]
Cash deposits	12	85
Demand deposits | ICE Clear Credit
Clearing Organizations [Line Items]
Cash deposits	2,762	3,807
Demand deposits | Other ICE Clearing Houses
Clearing Organizations [Line Items]
Cash deposits	12	8
U.S. Treasuries | ICE Clear US
Clearing Organizations [Line Items]
Cash deposits	1,790	2,340
Unsettled Variation Margin and Delivery Contracts Receivable/Payable | ICE NGX
Clearing Organizations [Line Items]
Cash deposits	592	1,137
Cash Deposit Based On Euro/US Dollar Exchange Rate | De Nederlandsche Bank | ICE Clear Europe
Clearing Organizations [Line Items]
Cash deposits	$ 3,500	$ 8,000		€ 3,000		€ 7,000
Exchange rate to USD	1.1371	1.1466
Cash Deposit Based On Euro/US Dollar Exchange Rate | Bank of England | ICE Clear Europe
Clearing Organizations [Line Items]
Cash deposits	$ 11			€ 10
Cash Deposit Based On Pound Sterling/US Dollar Exchange Rate | Bank of England | ICE Clear Europe
Clearing Organizations [Line Items]
Cash deposits	$ 635	$ 638	£ 500		£ 500
Exchange rate to USD	1.2698	1.2756