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Company Restructuring (Tables) | 12 Months Ended
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Dec. 31, 2017
Restructuring and Related Activities [Abstract] |
Schedule of changes in the restructuring liability |
Changes in the restructuring liability
($ in millions) |  | Employee costs |  | Exit costs |  | Total liability
Balance as of December 31, 2016 |  | $ | — |  |  | $ | 2 |  |  | $ | 2 |
Expense incurred |  | 47 |  |  | 42 |  |  | 89 |
Adjustments to liability |  | (3 | ) |  | — |  |  | (3 | )
Payments applied against liability |  | (29 | ) |  | (14 | ) |  | (43 | )
Balance as of December 31, 2017 |  | $ | 15 |  |  | $ | 30 |  |  | $ | 45 |

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- Definition Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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