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Goodwill and Other Intangible Assets (Other Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized intangible assets: |  |
Other intangible assets, gross | $ 1,773 | $ 1,266
Other intangible assets, accumulated amortization | 481 | 397
Other intangible assets, net | 1,292 | 869
Patents, Trademarks, and Trade Names [Member] |  |
Amortized intangible assets: |  |
Other intangible assets, gross | 465 | 382
Other intangible assets, accumulated amortization | 203 | 188
Other intangible assets, net | 262 | 194
Customer Lists and Other [Member] |  |
Amortized intangible assets: |  |
Other intangible assets, gross | 1,308 | 884
Other intangible assets, accumulated amortization | 278 | 209
Other intangible assets, net | $ 1,030 | $ 675

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