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Nature of Operations and Basis of Presentation (Tables) | 3 Months Ended
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Mar. 31, 2019
Nature of Operations and Basis of Presentation [Abstract] |
Schedule of Future Minimum Commitments for Operating Leases | The following table summarizes our minimum commitments under noncancelable operating leases having initial terms in excess of one year, primarily for property, at December 31, 2018 as disclosed in our 2018 Form 10-K:
| Years Ending December 31,
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |  | Total
Minimum commitments(a) | $ | 296 |  |  | $ | 286 |  |  | $ | 247 |  |  | $ | 180 |  |  | $ | 146 |  |  | $ | 582 |  |  | $ | 1,737 |
Sublease income | (61 | ) |  | (51 | ) |  | (44 | ) |  | (38 | ) |  | (33 | ) |  | (129 | ) |  | (356 | )
Net minimum commitments | $ | 235 |  |  | $ | 235 |  |  | $ | 203 |  |  | $ | 142 |  |  | $ | 113 |  |  | $ | 453 |  |  | $ | 1,381 |
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(a) | Certain leases contain escalation clauses and renewal or purchase options.

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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://fasb.org/us-gaap/role/ref/legacyRef -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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