Acquisitions (Identifiable Intangible Assets Schedule) (Details) - USD ($) $ in Millions		6 Months Ended
	Dec. 14, 2015	Jun. 30, 2016	Dec. 31, 2015	Dec. 11, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Other intangible assets, net		$ 10,493	$ 10,758
Interactive Data Holdings Corporation Acquisition [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)		(52)
Finite-Lived Intangible Assets, Accumulated Amortization		(91)
Intangible Assets, Gross (Excluding Goodwill)	$ 2,883
Other intangible assets, net		2,740
Interactive Data Holdings Corporation Acquisition [Member] | Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	168
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)		(3)
Finite-Lived Intangible Assets, Accumulated Amortization		(13)
Finite-Lived Intangible Assets, Net		152
Interactive Data Holdings Corporation Acquisition [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 2,452
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)		(45)
Finite-Lived Intangible Assets, Accumulated Amortization		(55)
Finite-Lived Intangible Assets, Net		2,352
Interactive Data Holdings Corporation Acquisition [Member] | Data/Databases [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years
Interactive Data Holdings Corporation Acquisition [Member] | In Process Research and Development [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)		(3)
Finite-Lived Intangible Assets, Accumulated Amortization		0
Indefinite-lived Intangible Assets Acquired	$ 129	126
Interactive Data Holdings Corporation Acquisition [Member] | Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years
Interactive Data Holdings Corporation Acquisition [Member] | Database Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)		(1)
Finite-Lived Intangible Assets, Accumulated Amortization		(16)
Finite-Lived Intangible Assets, Net		92
Indefinite-lived Intangible Assets Acquired	$ 109
Interactive Data Holdings Corporation Acquisition [Member] | Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)		0
Finite-Lived Intangible Assets, Accumulated Amortization		(6)
Finite-Lived Intangible Assets, Net		6
Indefinite-lived Intangible Assets Acquired	$ 12
Interactive Data Holdings Corporation Acquisition [Member] | Non-arrangement Transactions [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year
Interactive Data Holdings Corporation Acquisition [Member] | Market Data Fee and Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	20 years
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)		0
Finite-Lived Intangible Assets, Accumulated Amortization		0
Finite-Lived Intangible Assets, Net		11
Indefinite-lived Intangible Assets Acquired	$ 11
Interactive Data Holdings Corporation Acquisition [Member] | Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)		0
Finite-Lived Intangible Assets, Accumulated Amortization		(1)
Finite-Lived Intangible Assets, Net		1
Indefinite-lived Intangible Assets Acquired	2
TRAYPORT [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)		(33)
Finite-Lived Intangible Assets, Accumulated Amortization		(9)
Intangible Assets, Gross (Excluding Goodwill)				$ 274
Other intangible assets, net		232
TRAYPORT [Member] | Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	14
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)		(1)
Finite-Lived Intangible Assets, Accumulated Amortization		(2)
Finite-Lived Intangible Assets, Net		11
TRAYPORT [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 242
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	20 years
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)		(30)
Finite-Lived Intangible Assets, Accumulated Amortization		(7)
Finite-Lived Intangible Assets, Net		205
TRAYPORT [Member] | Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)		(2)
Finite-Lived Intangible Assets, Accumulated Amortization		0
Finite-Lived Intangible Assets, Net		$ 16
Indefinite-lived Intangible Assets Acquired	$ 18
Minimum [Member] | Interactive Data Holdings Corporation Acquisition [Member] | Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Minimum [Member] | Interactive Data Holdings Corporation Acquisition [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	20 years
Minimum [Member] | TRAYPORT [Member] | Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years
Maximum [Member] | Interactive Data Holdings Corporation Acquisition [Member] | Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years
Maximum [Member] | Interactive Data Holdings Corporation Acquisition [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	25 years
Maximum [Member] | TRAYPORT [Member] | Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years