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Segment Reporting - Schedule of Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Total revenues $ 2,429 $ 2,387 $ 7,237 $ 7,259
Transaction-based expenses 426 576 1,450 1,735
Total revenues, less transaction-based expenses 2,003 1,811 5,787 5,524
Operating expenses 1,158 898 3,018 2,750
Operating income 845 913 2,769 2,774
Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 1,540 1,577 4,754 4,824
Transaction-based expenses 426 576 1,450 1,735
Total revenues, less transaction-based expenses 1,114 1,001 3,304 3,089
Operating expenses 313 301 944 904
Operating income 801 700 2,360 2,185
Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 559 534 1,668 1,555
Transaction-based expenses 0 0 0 0
Total revenues, less transaction-based expenses 559 534 1,668 1,555
Operating expenses 358 337 1,057 1,029
Operating income 201 197 611 526
Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 330 276 815 880
Transaction-based expenses 0 0 0 0
Total revenues, less transaction-based expenses 330 276 815 880
Operating expenses 487 260 1,017 817
Operating income (157) 16 (202) 63
Energy futures and options        
Segment Reporting Information [Line Items]        
Total revenues 384 266 1,084 884
Energy futures and options | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 384 266 1,084 884
Energy futures and options | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Energy futures and options | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Agricultural and metals futures and options        
Segment Reporting Information [Line Items]        
Total revenues 61 57 208 179
Agricultural and metals futures and options | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 61 57 208 179
Agricultural and metals futures and options | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Agricultural and metals futures and options | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Financial futures and options        
Segment Reporting Information [Line Items]        
Total revenues 112 122 344 375
Financial futures and options | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 112 122 344 375
Financial futures and options | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Financial futures and options | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Cash equities and equity options        
Segment Reporting Information [Line Items]        
Total revenues 519 664 1,734 2,021
Cash equities and equity options | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 519 664 1,734 2,021
Cash equities and equity options | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Cash equities and equity options | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
OTC and other        
Segment Reporting Information [Line Items]        
Total revenues 104 121 309 326
OTC and other | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 104 121 309 326
OTC and other | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
OTC and other | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Data and connectivity services        
Segment Reporting Information [Line Items]        
Total revenues 236 219 699 651
Data and connectivity services | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 236 219 699 651
Data and connectivity services | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Data and connectivity services | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Listings        
Segment Reporting Information [Line Items]        
Total revenues 124 128 376 388
Listings | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 124 128 376 388
Listings | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Listings | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Fixed income execution        
Segment Reporting Information [Line Items]        
Total revenues 29 26 89 66
Fixed income execution | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Fixed income execution | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 29 26 89 66
Fixed income execution | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
CDS clearing        
Segment Reporting Information [Line Items]        
Total revenues 94 88 279 226
CDS clearing | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
CDS clearing | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 94 88 279 226
CDS clearing | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Fixed income data and analytics        
Segment Reporting Information [Line Items]        
Total revenues 279 273 832 824
Fixed income data and analytics | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Fixed income data and analytics | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 279 273 832 824
Fixed income data and analytics | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Other data and network services        
Segment Reporting Information [Line Items]        
Total revenues 157 147 468 439
Other data and network services | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Other data and network services | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 157 147 468 439
Other data and network services | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Origination technology        
Segment Reporting Information [Line Items]        
Total revenues 172 197 524 617
Origination technology | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Origination technology | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Origination technology | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 172 197 524 617
Closing solutions        
Segment Reporting Information [Line Items]        
Total revenues 48 56 136 195
Closing solutions | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Closing solutions | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Closing solutions | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 48 56 136 195
Servicing software        
Segment Reporting Information [Line Items]        
Total revenues 69 0 69 0
Servicing software | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Servicing software | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Servicing software | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues 69 0 69 0
Data and analytics        
Segment Reporting Information [Line Items]        
Total revenues 41 23 86 68
Data and analytics | Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Data and analytics | Fixed Income and Data Services Segment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Data and analytics | Mortgage Technology Segment        
Segment Reporting Information [Line Items]        
Total revenues $ 41 $ 23 $ 86 $ 68