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Goodwill and Other Intangibles (Other Intangible Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross $ 1,026 $ 954
Finite-lived intangible assets, accumulated amortization (476) (387)
Finite-lived intangible assets, net 550 567
Intangible assets, gross (excluding goodwill) 3,067 2,939
Total intangible assets, net (excluding goodwill) 2,591 2,552
Trademarks, indefinite lives    
Finite-Lived Intangible Assets [Line Items]    
Trademarks, indefinite lives 2,041 1,985
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 639 617
Finite-lived intangible assets, accumulated amortization (297) (237)
Finite-lived intangible assets, net $ 342 380
Customer relationships | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset, useful life 3 years  
Customer relationships | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset, useful life 16 years  
Patents and non-competes    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross $ 387 337
Finite-lived intangible assets, accumulated amortization (179) (150)
Finite-lived intangible assets, net $ 208 $ 187
Patents and non-competes | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset, useful life 1 year  
Patents and non-competes | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset, useful life 41 years