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Acquisitions and Divestitures (Summary of Intangible Assets Acquired) (Details) - Pure - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 31, 2018
Business Acquisition [Line Items]
Intangible assets		$ 149
Customer Relationships
Business Acquisition [Line Items]
Intangible assets		84
Technology
Business Acquisition [Line Items]
Intangible assets		38
Tradenames
Business Acquisition [Line Items]
Life	20 years
Intangible assets		21
Software Development
Business Acquisition [Line Items]
Intangible assets		$ 6
Minimum \| Customer Relationships
Business Acquisition [Line Items]
Life	17 years
Minimum \| Technology
Business Acquisition [Line Items]
Life	3 years
Minimum \| Software Development
Business Acquisition [Line Items]
Life	3 years
Maximum \| Customer Relationships
Business Acquisition [Line Items]
Life	18 years
Maximum \| Technology
Business Acquisition [Line Items]
Life	10 years