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Acquisitions and Divestitures - Acquisition Purchase Prices and Allocation (Details) - USD ($) $ in Millions	Jun. 12, 2019	Jul. 23, 2018	Jan. 02, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill				$ 13,342	$ 13,085	$ 12,216
Simplifile
Business Acquisition [Line Items]
Cash held on the date of acquisition	$ 12
Identifiable Intangible Assets	113
Goodwill	218
Other working capital adjustments	7
Total purchase price cash consideration	338
TMC Bonds
Business Acquisition [Line Items]
Cash held on the date of acquisition		$ 15
Identifiable Intangible Assets		260
Goodwill		423
Other working capital adjustments		17
Total purchase price cash consideration		700
BondPoint
Business Acquisition [Line Items]
Identifiable Intangible Assets			$ 130
Goodwill			267
Other working capital adjustments			3
Total purchase price cash consideration			400
Customer relationship intangibles | Simplifile
Business Acquisition [Line Items]
Identifiable Intangible Assets	$ 104
Useful Life	20 years
Customer relationship intangibles | TMC Bonds
Business Acquisition [Line Items]
Identifiable Intangible Assets		$ 253
Useful Life		15 years
Customer relationship intangibles | BondPoint
Business Acquisition [Line Items]
Identifiable Intangible Assets			$ 123
Useful Life			15 years
Developed technology intangibles | Simplifile
Business Acquisition [Line Items]
Identifiable Intangible Assets	$ 7
Useful Life	7 years
Developed technology intangibles | TMC Bonds
Business Acquisition [Line Items]
Identifiable Intangible Assets		$ 7
Useful Life		3 years
Developed technology intangibles | BondPoint
Business Acquisition [Line Items]
Identifiable Intangible Assets			$ 7
Useful Life			3 years
Trade name intangibles | Simplifile
Business Acquisition [Line Items]
Identifiable Intangible Assets	$ 2
Useful Life	5 years
Trade name intangibles | TMC Bonds
Business Acquisition [Line Items]
Identifiable Intangible Assets		$ 0
Trade name intangibles | BondPoint
Business Acquisition [Line Items]
Identifiable Intangible Assets			$ 0

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Business Combination, Other Working Capital Adjustment

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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