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Clearing Operations (Narrative) (Details)	1 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) fund contract	Dec. 31, 2017 USD ($) contract
Clearing Operations [Line Items]
Number of member sponsored default funds | fund			4
Loss due to commodities market default		$ 133,000,000
Loss due to commodities market default allocated to junior capital		8,000,000
Increase to commodities market to junior capital		14,000,000
Capital relief program expense	$ 23,000,000
Collateral due to market default	112,000,000		$ 112,000,000
Default funds and margin deposits	4,742,000,000		4,742,000,000	$ 3,988,000,000
Default fund contributions	499,000,000		499,000,000
Committed capital	268,000,000		268,000,000	235,000,000
Liability due to market default	0		0
Liability Waterfall
Clearing Operations [Line Items]
Loss due to commodities market default allocated to junior capital		$ 8,000,000
Junior capital, cash deposits and pledged assets	31,000,000		31,000,000
Senior capital, cash deposits and pledged assets	23,000,000		23,000,000
Committed capital	67,000,000		67,000,000
Utilize as capital resources
Clearing Operations [Line Items]
Default fund contributions	436,000,000		436,000,000
Utilize as member posted surplus balance
Clearing Operations [Line Items]
Default fund contributions	63,000,000		63,000,000
Nasdaq Clearing
Clearing Operations [Line Items]
Default fund cash contributions invested in highly rated government debt securities			$ 1,483,000,000
Maturity period of time deposits			90 days
Committed capital	121,000,000		$ 121,000,000
Power of assessment of the clearing member's contribution to the financial markets and commodities markets default funds			100.00%
Contract value of resale and repurchase agreements	500,000,000		$ 500,000,000	$ 2,300,000,000
Total number of derivative contracts cleared | contract			9,223,246	8,534,986
Nasdaq Clearing | Reverse Repurchase Agreements
Clearing Operations [Line Items]
Default funds and margin deposits	$ 166,000,000		$ 166,000,000
Minimum
Clearing Operations [Line Items]
Reverse purchase agreements, maturity range			4 days
Maximum
Clearing Operations [Line Items]
Reverse purchase agreements, maturity range			17 days

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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