Revenue Recognition - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) obligation	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Disaggregation of Revenue [Line Items]
Number of performance obligations | obligation	2
Number of performance obligations related to trade execution | obligation	1
Rebates	$ 844	$ 749	$ 674
Period of customer revenue list recognized for NYSE	9 years
Period of customer revenue list recognized for NYSE area and NYSE American	5 years
Period of customer revenue list recognized for NYSE, modifications	6 years
Period of customer revenue list recognized for NYSE area and NYSE American, modifications	3 years
Total revenues	$ 6,276	5,843	5,971
Period of recognition of performance obligations	2 years
Transaction and clearing, net
Disaggregation of Revenue [Line Items]
Total revenues	$ 3,483	3,131	3,384
Trading and Clearing Segment
Disaggregation of Revenue [Line Items]
Total revenues	3,717	3,333	3,561
Services transferred over time | Trading and Clearing Segment | Transaction and clearing, net
Disaggregation of Revenue [Line Items]
Total revenues	$ 248	$ 226	$ 219
Period of recognition of performance obligations	1 month