Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Indefinite-lived Intangible Assets by Major Class [Line Items]
Other intangible assets	$ 846	$ 846
Weighted-average life of the intangible assets	12 years
Amortization of intangibles	$ 123	122	$ 122
Maximum
Indefinite-lived Intangible Assets by Major Class [Line Items]
Weighted-average life of the intangible assets	21 years
Market Intelligence
Indefinite-lived Intangible Assets by Major Class [Line Items]
Amortization of intangibles	$ 76	75	73
Indices
Indefinite-lived Intangible Assets by Major Class [Line Items]
Amortization of intangibles	6	6	6
Intellectual Property
Indefinite-lived Intangible Assets by Major Class [Line Items]
Carrying value of trade name and licenses	380	380
Intellectual Property | Indices
Indefinite-lived Intangible Assets by Major Class [Line Items]
Carrying value of trade name and licenses		132	132
Tradenames
Indefinite-lived Intangible Assets by Major Class [Line Items]
Carrying value of trade name and licenses	$ 90	90
Tradenames | Market Intelligence
Indefinite-lived Intangible Assets by Major Class [Line Items]
Carrying value of trade name and licenses		185	185
Goldman Sachs Commodity and Broad Market Intellectual Property | Indices
Indefinite-lived Intangible Assets by Major Class [Line Items]
Carrying value of trade name and licenses		$ 59	$ 59