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Goodwill and Other Intangibles (Changes in Net Carrying Amount of Goodwill by Segment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Goodwill, Beginning balance $ 7,168 $ 6,356
Additions and adjustments 1,470 664
Foreign exchange (75) 148
Goodwill, Ending balance 8,563 7,168
Orthopaedics    
Goodwill [Roll Forward]    
Goodwill, Beginning balance 2,426 2,372
Additions and adjustments 4 2
Foreign exchange (31) 52
Goodwill, Ending balance 2,399 2,426
MedSurg    
Goodwill [Roll Forward]    
Goodwill, Beginning balance 3,509 2,934
Additions and adjustments 100 553
Foreign exchange (28) 22
Goodwill, Ending balance 3,581 3,509
Neuro and Spine    
Goodwill [Roll Forward]    
Goodwill, Beginning balance 1,233 1,050
Additions and adjustments 1,366 109
Foreign exchange (16) 74
Goodwill, Ending balance $ 2,583 $ 1,233