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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Future Minimum Payments Under Operating Leases [Table Text Block] | Lease commitments — Cash obligations under future minimum rental commitments under operating leases and net rental expense at December 31, 2017 are shown in the table below. Operating lease commitments are primarily related to facilities. The significant increase in lease commitments at December 31, 2017 reflects the impact of the acquisitions made during 2017. See also Note 2 for additional information about our acquisitions.
| 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter |  | Total
Lease commitments | $ | 53 |  |  | $ | 48 |  |  | $ | 45 |  |  | $ | 39 |  |  | $ | 31 |  |  | $ | 90 |  |  | $ | 306 |
Rent Expense [Table Text Block] |
| 2017 |  | 2016 |  | 2015
Rent expense | $61 |  | $50 |  | $49

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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