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Lease Commitments (Tables) | 12 Months Ended
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Dec. 31, 2017
Leases, Operating [Abstract] |
Rental expenses for operating leases | 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 |
Future minimum rental payments under operating leases for continuing operations that have initial or remaining noncancelable lease terms in excess of one year, net of sublease rental income | 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 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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