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Acquisition (Tables) | 12 Months Ended
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Dec. 31, 2017
Business Combinations [Abstract] |
Future amortization expense |
Amortization expense of intangible assets for the next five years and thereafter
($ in millions) |  |
2018 |  | $ | 82 |
2019 |  | 72 |
2020 |  | 62 |
2021 |  | 52 |
2022 |  | 42 |
Thereafter |  | 84 |
Total amortization |  | $ | 394 |

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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