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Lease Commitments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Rental expenses for operating leases |  |  |
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 |  |  |
Gross rental commitment 2018 | 318 |  |
Gross rental commitment 2019 | 291 |  |
Gross rental commitment 2020 | 249 |  |
Gross rental commitment 2021 | 226 |  |
Gross rental commitment 2022 | 205 |  |
Gross rental commitment thereafter | 631 |  |
Total gross rental commitments | 1,920 |  |
Sublease income 2018 | (41) |  |
Sublease income 2019 | (42) |  |
Sublease income 2020 | (35) |  |
Sublease income 2021 | (34) |  |
Sublease income 2022 | (34) |  |
Sublease income thereafter | (18) |  |
Total future sublease income | (204) |  |
Net rental commitment 2018 | 277 |  |
Net rental commitment 2019 | 249 |  |
Net rental commitment 2020 | 214 |  |
Net rental commitment 2021 | 192 |  |
Net rental commitment 2022 | 171 |  |
Net rental commitment thereafter | 613 |  |
Total minimum payments required | $ 1,716 |  |

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- Definition For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within one year of the balance sheet date, net of sublease rental income, relating to leases defined as operating. + References No definition available. + Details
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