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Cash And Cash Equivalents (Tables) | 12 Months Ended
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Dec. 31, 2018
Cash and cash equivalents |
Cash and Cash Equivalents |
($ millions) |  | December 31 2018 |  | December 31 2017 |
Cash |  | 1 285 |  | 1 184 |
Cash equivalents |  | 936 |  | 1 488 |
|  | 2 221 |  | 2 672 |

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