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Cash And Cash Equivalents (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash and cash equivalents |
Cash and Cash Equivalents |
($ millions) |  | Dec 31 2017 |  | Dec 31 2016 |
Cash |  | 1 184 |  | 1 103 |
Cash equivalents |  | 1 488 |  | 1 913 |
|  | 2 672 |  | 3 016 |

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- Definition Tabular disclosure of cash and cash equivalents. + References No definition available. + Details
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