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Business Combinations Allocation of Purchase Price (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]    
Goodwill $ 4,014 $ 3,979
Series of Individually Immaterial Business Acquisitions [Member]    
Business Acquisition [Line Items]    
Cash 4  
Current assets 9  
Property, plant and equipment and other noncurrent assets 4  
Goodwill 76  
Current liabilities 5  
Noncurrent liabilities 2  
Purchase price, inclusive of contingent consideration 95  
Customer Relationships [Member] | Series of Individually Immaterial Business Acquisitions [Member]    
Business Acquisition [Line Items]    
Intangible assets acquired $ 9  
Weighted Average Useful Life 5 years