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Commitments | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Commitments | Commitments Centene and its subsidiaries lease office facilities and various equipment under non-cancelable operating leases which may contain escalation provisions. The rental expense related to these leases is recorded on a straight-line basis over the lease term, including rent holidays. Tenant improvement allowances are recorded as a liability and amortized against rent expense over the term of the lease. Rent expense was $171 million, $137 million and $64 million for the years ended December 31, 2017, 2016 and 2015, respectively. Annual non-cancelable minimum lease payments over the next five years and thereafter are as follows ($ in millions):
2018 | $ | 146 |
2019 | 153 |
2020 | 138 |
2021 | 116 |
2022 | 73 |
Thereafter | 167 |
| $ | 793 |
In connection with obtaining regulatory approval of the Health Net acquisition from the California Department of Insurance and the California Department of Managed Health Care, the Company committed to certain undertakings. See Note 3, Health Net for further details.

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- Definition The entire disclosure for significant arrangements with third parties, which includes operating lease arrangements and arrangements in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services, and operating lease arrangements. Descriptions may include identification of the specific goods and services, period of time covered, minimum quantities and amounts, and cancellation rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -URI http://asc.fasb.org/topic&trid=2144648 + Details
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