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Lease Commitments | 12 Months Ended
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Dec. 31, 2017
Leases, Operating [Abstract] |
Lease Commitments | Lease Commitments The Company leases office facilities, equipment, and automobiles under non-cancelable operating leases. These leases expire at various dates and may contain renewal and expansion options. In addition to base rental costs, occupancy lease agreements generally provide for rent escalations resulting from increased assessments for real estate taxes and other charges. The Company’s lease obligations are primarily for the use of office space. Rental expenses (including amounts applicable to taxes, insurance, and maintenance) for operating leases are as follows (in millions):
Years Ended December 31 | 2017 |  | 2016 |  | 2015
Rental expense | $ | 377 |  |  | $ | 358 |  |  | $ | 413 |
Sub lease rental income | (57 | ) |  | (52 | ) |  | (73 | )
Net rental expense | $ | 320 |  |  | $ | 306 |  |  | $ | 340 |
At December 31, 2017, future minimum rental payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year are as follows (in millions):
Year Ended December 31, 2017 | Gross rental commitments |  | Rentals from subleases |  | Net rental commitments
2018 | $ | 318 |  |  | $ | (41 | ) |  | $ | 277 |
2019 | 291 |  |  | (42 | ) |  | 249 |
2020 | 249 |  |  | (35 | ) |  | 214 |
2021 | 226 |  |  | (34 | ) |  | 192 |
2022 | 205 |  |  | (34 | ) |  | 171 |
Thereafter | 631 |  |  | (18 | ) |  | 613 |
Total minimum payments required | $ | 1,920 |  |  | $ | (204 | ) |  | $ | 1,716 |

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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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- References No definition available. + Details
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