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Acquisitions and Divestitures Acquisitions and Divestitures, Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
Mar. 30, 2018
Feb. 16, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
Goodwill recognized $ 6,632   $ 6,615
Variable Interest Entity, Not Primary Beneficiary [Member] | Peak Nano [Member]      
Schedule of Equity Method Investments [Line Items]      
Investment in nonconsolidated affiliate (percent)   25.00%  
Purchase price   $ 20  
Contingent milestone payment   30  
Goodwill recognized   11  
IPR&D [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Peak Nano [Member]      
Schedule of Equity Method Investments [Line Items]      
Indefinite-lived intangible assets   $ 13