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Goodwill and Intangible Assets (Goodwill balance by business segment) (Details) | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 USD ($) segment | Sep. 30, 2019 USD ($) segment | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Goodwill Information |  |  |  |  |
Number of business combinations completed |  |  |  |  | 0
Purchased goodwill from acquisitions |  | $ 508,000,000 |  | $ 508,000,000 |
Goodwill |  |  |  |  |
Balance at the beginning of the period | $ 10,051,000,000 |  | $ 10,051,000,000 | 10,051,000,000 |
Acquisition activity |  |  |  | 508,000,000 |
Divestiture activity |  |  |  | (49,000,000) |
Translation and other |  |  |  | (100,000,000) |
Balance at the end of the period |  | $ 10,410,000,000 |  | 10,410,000,000 |
Number of business segments | segment | 5 | 4 |  |  |
Previous Number Of Reportable Segments | segment |  | 4 |  |  |
Amount of Goodwill impairment |  |  | 0 |  |
Safety and Industrial |  |  |  |  |
Goodwill |  |  |  |  |
Balance at the beginning of the period | $ 4,716,000,000 |  | 4,716,000,000 | 4,716,000,000 |
Divestiture activity |  |  |  | (49,000,000) |
Translation and other |  |  |  | (51,000,000) |
Balance at the end of the period |  | $ 4,616,000,000 |  | 4,616,000,000 |
Transportation and Electronics |  |  |  |  |
Goodwill |  |  |  |  |
Balance at the beginning of the period | 1,857,000,000 |  | 1,857,000,000 | 1,857,000,000 |
Translation and other |  |  |  | (27,000,000) |
Balance at the end of the period |  | 1,830,000,000 |  | 1,830,000,000 |
Health Care |  |  |  |  |
Goodwill |  |  |  |  |
Balance at the beginning of the period | 3,248,000,000 |  | 3,248,000,000 | 3,248,000,000 |
Acquisition activity |  |  |  | 508,000,000 |
Translation and other |  |  |  | (53,000,000) |
Balance at the end of the period |  | 3,703,000,000 |  | 3,703,000,000 |
Consumer |  |  |  |  |
Goodwill |  |  |  |  |
Balance at the beginning of the period | $ 230,000,000 |  | $ 230,000,000 | 230,000,000 |
Translation and other |  |  |  | 31,000,000 |
Balance at the end of the period |  | $ 261,000,000 |  | $ 261,000,000 |

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