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Goodwill and Other Intangible Assets (Acquisition-Related Intangible Assets that are being Amortized) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 5,888   $ 6,177
Accumulated Amortization 3,825   3,957
Net Carrying Amount 2,063   2,220
Patents and developed technology      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 5,093   5,125
Accumulated Amortization 3,491   3,394
Net Carrying Amount 1,602   1,731
Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 92   349
Accumulated Amortization 65   308
Net Carrying Amount 27   41
Trade names and other      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 703   703
Accumulated Amortization 269   255
Net Carrying Amount 434   $ 448
Acquisition-related intangible assets      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization of acquisition-related intangible assets $ 197 $ 195