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Other Assets (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
OTHER ASSETS. |
Other Assets |
($ millions) |  | Dec 31 2017 |  | Dec 31 2016 |
Investments |  | 224 |  | 191 |
Prepaids and other |  | 987 |  | 1 057 |
|  | 1 211 |  | 1 248 |

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