Acquisitions and Divestitures Purchase Price Allocation to Identifiable Intangible Assets Acquired (Details) - Cerebos $ in Millions	Mar. 09, 2018 USD ($)
Business Acquisition [Line Items]
Identifiable intangible assets acquired	$ 100
Trademarks
Business Acquisition [Line Items]
Identifiable intangible assets acquired	$ 87
Definite-lived intangible asset, weighted average life	22 years
Customer-related assets
Business Acquisition [Line Items]
Identifiable intangible assets acquired	$ 13
Definite-lived intangible asset, weighted average life	12 years